difficult problem; challenge
correspondence (to); equivalence; suitability; coordination; dealing with; coping with
to learn; to study; to take lessons in
aim (of a gun, bow, etc.); aim; object; objective
to connect; to link together; to tie; to fasten; to maintain; to preserve; to transfer (phone call)
omitting (reluctantly); leaving out; dropping; giving up (reluctantly); parting with; sharing
to become misty; to become hazy; to get blurry; to grow dim; to be overshadowed; to be upstaged
that way; that direction; that (one); that person; there; over there
paying one's own expenses; going into business for oneself; working independently; person who earns their own living
quickly; promptly; immediately; indifferently; coldly
erasure; deletion; elimination (of variables); extinction
sky; the skies; high-altitude sky; upper air
following; pursuing; tracking; shadowing; tailing; chasing
terrific; staggering; tremendous; frightful; ghastly; horrific
field; plain; hidden interior part (of a structure or object); wild (of an animal or plant)
to jump over; to leap over; to fly over; to fly across; to jump ahead (of someone); to skip over
branch; bough; limb; twig; sprig; spray
ski jump; jump ramp (skateboarding, BMX, etc.); launch ramp; wedge ramp
acceleration; speeding up
running as fast as one can
to catch up (with); to draw level; to pull even; to be compensated; to make up for one's losses
sudden; abrupt; unexpected; unforeseen
light (color, taste, etc.); faint (e.g. smell); pale; faint (feeling, hope, etc.); fleeting; slight
groan; moan; growl; roar; hum (of a machine, power lines, etc.); drone (e.g. of an engine)
pure white; blank (e.g. mind, paper)
coat (of hair or fur); lie of (dog's) hair; type; sort; lineage; breeding
firmly; solidly; sturdily; strongly; toughly
the (four) limbs; arms and legs
ground; earth's surface; land; lot; plot
to step firmly (on); to harden by treading
to begin to run; to start running; to break into a run; to start moving (e.g. a vehicle); to take off; to get under way
an order of magnitude higher; off by a digit; in a different league; unbelievable; incomparable; unimaginable
to pass (by) each other; to brush past; to miss (meeting) each other; to fail to meet; to be at odds; to clash
to stare in wonder; to be amazed
across; over; beyond; throughout (a period of time); for
blink (of eyes); wink; twinkling (of stars); flicker (of light); blink (of light)
inside; within; while (e.g. one is young); during; among; amongst; in (secret, chaos, poverty, etc.)
to go away; to become more distant; to fade away; to be estranged
horizon (related to land)
spirit; psyche; god; deity; divinity
hometown; birthplace; native place; (arch.) ruins; (arch.) historic remains