one copy (of a document);  one letter;  one-way traffic;  pure straight;  winning hand containing nine consecutive tiles of the same suit (i.e. 1-9)
 beginning (of writing);  opening passage (sentence, paragraph, etc.);  written claim;  bill
 one long cylindrical thing;  one film, TV show, etc.;  one version;  one book;  a certain book;  ippon;  one point
 important;  significant;  precious;  valuable;  careful
 to turn away;  to bear off;  to veer away;  to deviate (e.g. of a conversation);  to digress;  to go astray
 anyhow;  at any rate;  anyway;  somehow or other;  generally speaking;  in any case
 to be disheartened;  to lose heart;  to be sprained;  to be snapped;  to be broken
 (school) class change;  class shuffle;  rearrangement of which students are in which teacher's class
 while;  during (the time when)
 all;  entire;  whole;  altogether
 authority;  expert;  counter for messages, letters, notes, documents, etc.;  understanding (esp. of male-female relations);  tact;  supernatural powers
 only;  just;  since;  after;  remaining (in a particular state)
 unexpectedly;  suddenly;  abruptly
 to stop;  to cease;  to come to an end;  to cut off
 after all;  in the end;  conclusion;  end;  end of a game of go, shogi, etc.
 true character;  true form;  true colors (colours);  consciousness;  one's senses
 ending;  quitting;  closing;  ending before one had time to do something one wanted or intended to
 clue;  lead;  key;  handhold;  hold
 position;  situation;  viewpoint;  standpoint;  point of view
 cannot (do);  it is impossible that...;  it is (highly) unlikely that...
 near oneself;  close to one;  familiar
 or;  either ... or;  maybe;  perhaps;  some ... and others ...;  sometimes ... and at other times ...
 information;  news;  intelligence;  information;  data contained in characters, signals, code, etc.
 primary school;  elementary school;  grade school
 person concerned;  people involved (in an event);  those concerned;  staff
 certain;  sure;  doubtless;  I have no doubt;  You can depend on it;  It's a safe bet
 secret;  private;  surreptitious
 to save;  to rescue;  to help;  to assist;  to support (financially);  to contribute (to)
 chance;  start;  cue;  excuse;  motive;  impetus
 possibly;  by some possibility;  perhaps
 teacher;  instructor;  sensei;  title or form of address for a teacher, master, doctor, lawyer, etc.;  intimate or teasing form of address; (arch.)  one's elder
 postbox;  mailbox;  post;  position;  post (e.g. goalpost);  post- (e.g. post-Cold War)
 postmark;  (postal) cancellation mark
 mail service;  postal service;  mail;  mail;  postal matter;  postal items
 direct;  immediate;  personal;  firsthand
 to put in;  to let in;  to admit;  to accept;  to accept;  to comply;  to include
 to be found;  to be discovered
 danger;  peril;  hazard;  risk
 to examine;  to look up;  to investigate;  to check up;  to sense;  to study