verb (v)

• establish after a calculation, investigation, experiment, survey, or study(verb.communication)

  Synonym:
  ascertain, determine, find
  

  source: wordnet30
• get to know or become aware of, usually accidentally(verb.cognition)

  Synonym:
  discover, get a line, get wind, get word, hear, learn, pick up, see
  

  source: wordnet30
• find out, learn, or determine with certainty, usually by making an inquiry or other effort(verb.communication)

  Example:
  Find out if he speaks Russian.
  

  Synonym:
  ascertain, check, determine, learn, see, watch
  

  source: wordnet30
• trap; especially in an error or in a reprehensible act(verb.cognition)

  Synonym:
  catch out
  

  source: wordnet30