one's line of sight;  one's gaze;  one's eyes (looking);  glance;  gaze;  look
 wired;  cabled;  communication by wire
 radio (communication);  wireless;  not using wires
 shamisen;  samisen;  three-stringed Japanese lute
 ultraviolet rays;  ultraviolet radiation
 white line;  linea alba (anot.)
 loop line;  (transportation) belt line
 grid-line (e.g. in spreadsheet);  enclosing line
 line along which to cut something off;  perforated line;  dotted line
 (weather-related) line of discontinuity
 winding (coil, armature, etc.)
 (one's) gaze;  direction in which one is looking;  point of view;  standpoint;  line covering someone's eyes (in an edited photograph)
 (weather) front;  front line;  forward area;  action zone
 horizon (related to land)
 horizon (related to bodies of water)
 line of defence (defense);  lines (as in enemy lines, etc.)
 borderline between life and death;  verge of death;  deadline (boundary around a prison which prisoners were not allowed to cross)
 coastline;  shoreline;  coastal railway
 parallel lines;  remaining far apart (e.g. in discussions);  not reaching an agreement
 infrared rays;  infrared radiation
 ridgeline;  lines of a mountain ridge
 lifeline;  matter of life or death;  indispensable thing;  life line (in palm reading)
 phone extension;  indoor wiring;  inner line
 disconnection;  interruption;  burn-out
 crossed wires or lines (of communication);  confusion
 oblique line;  forward slash
 the whole line;  all lines;  the whole ship
 defensive perimeter;  defence line;  defense line;  precaution;  safeguard;  safety measure
 outside telephone line;  outer circle
 beauty of slender female legs
 heartstrings;  koto string
 red line;  red-light district (marked by a red line on police maps);  non-legal public road (denoted by a red line on cadastral maps; sometimes no longer physically existing)
 sunlight;  rays of the Sun
 opposite lane;  oncoming lane;  opposite side of the road
 flow line;  streamline;  lines representing the flow of a fluid
 warning line;  police cordon
 centre line;  center line;  central line
 overhead wires;  elevated railway
 dotted line;  perforated line
 rifling marks on a fired bullet
 single track (railway);  single line;  solid wire;  solid-core wire;  single-strand wire
 domestic air route;  domestic airline (company)
 supply line;  line of communications
 ruled line;  rule;  chart;  crease;  score;  border
 outline;  contour line;  border line
 conventional train line (esp. non-Shinkansen)
 overhead line (for trains, trams, etc.);  overheard wire
 nasolabial fold;  smile line;  laugh line
 far-infrared rays;  far-infrared radiation;  FIR
 exclusive line (communications);  dedicated line
 railroad operating over private tracks
 shamisen;  samisen;  three-stringed Japanese lute
 double track;  two-track line
 saturated linework;  concentrated linework
 (railway) siding;  service line;  service wire
 blue line;  area around a red-light district where illegal prostitution occurred (marked on police maps by a blue line) (1940s-1956);  non-legal public waterway (denoted by a blue line on cadastral maps; sometimes no longer physically existing)
 line symmetry;  reflection symmetry;  axial symmetry
 backlight (in photography, etc.);  illumination (of the subject) from behind
 pregnancy stretch mark;  striae gravidarum
 both (railway) tracks;  (both) up and down tracks (lines)
 resistance level (e.g. in share prices);  resistance wire;  line of resistance
 heating element;  electrically-heated wire
 sidetrack;  siding;  lateral line (of a fish)
 loop line;  circle line;  circle route
 perpendicular line;  vertical line
 polyline;  broken line;  zigzag;  polygonal line
 starting lines in the ring
 dividing line;  parting line;  separation line
 line to fold along (e.g. origami, packaging);  bend line
 spiral (railway);  spiral loop;  curved railway line used to ascend steep hills
 reference line;  base line;  baseline;  datum line
 heavy line (for emphasis);  thick line;  underline;  border
 white candlestick (in a candlestick chart);  bullish candlestick
 front line of (trenches for) deployed soldiers
 dividing line;  intermediate line;  intermediate rays
 near infrared ray;  near infrared radiation
 head line (in palm reading)
 red candlestick (in a candlestick chart);  bearish candlestick
 ground wire;  earth wire;  earthed line
 stranded wire;  strand wire;  strand;  stranded cable;  stranded conductor;  twisted wire
 underground wire or cable
 overline;  overscore;  overbar
 magnet wire;  enameled wire
 Siegfried Line (German defensive line built before World War II)
 intelligence line (in palm reading)
 uninsulated electrical wire;  open-wire line;  bare wire;  bare conductor
 moderate line;  middle-of-the-road policy line
 tropics (of Cancer and Capricorn);  regression line
 private railway or bus line
 harbor railroad;  harbour railroad
 sanshin;  Okinawan traditional three-stringed instrument; precursor to the shamisen
 dividing line;  demarcation line
 line concentrator;  line multiplexer
 low-water mark;  low-tide line;  ebb-tide line
 linear script (e.g. Linear A, Linear B)
 carriageway marking;  lane marker;  compartment line;  division line
 speed lines;  lines drawn to represent motion
 fire support coordination line
 line of contact;  no man's land
 anode ray;  positive ray;  canal ray
 reflection coefficient chart
 power line;  high current electrical line
 weak electrical current line (e.g. intercom)
 boundary;  edge;  break line
 Wallace's line (hypothetical line separating the Oriental and Australian zoogeographical regions)
 coordinate graphics;  line graphics
 toll switch;  TS;  trunk exchange
 source of radiation;  radiation source
 Antarctic Circle (latitude)
 isopleth;  isogram;  isoline;  contour line;  isarithm
 line integral;  path integral;  contour integral;  curve integral
 high-water mark;  high-water line;  high-water shoreline
 Northern Limit Line;  North Limit Line;  NLL;  demarcation line in the Yellow Sea between North Korea and South Korea
 isocheim;  isochime;  isochryme;  map contour connecting points with the same mean winter temperature
 isogonic line;  isogonal line
 stretch mark (caused by obesity);  stria
 Fermi Gamma-ray Space Telescope
 cross-cut;  crossline;  transversal;  transverse line
 Distant Early Warning Line (US, Canada);  DEW Line
 Plimsoll line;  load line;  load waterline
 rice noodle soup (Yunnan cuisine); (lit.) crossing-the-bridge noodles
 nine-dash line (demarcation line of China's territorial claims in the South China sea);  nine-dotted line
 uncompleted (railway) line
 asymmetric digital subscriber line;  ADSL
 coefficient of linear expansion
 support line;  support level;  supporting wire;  subsidiary wire