hap·pen /ˈhæpən, pṃ/
  (vi.)發生;碰巧,偶然;巧遇,偶然發現
  Hap·pen v. i. [imp. & p. p. Happened p. pr. & vb. n. Happening.]
  1. To come by chance; to come without previous expectation; to fall out.
     There shall no evil happen to the just.   --Prov. xii. 21.
  2. To take place; to occur.
     All these things which had happened.   --Luke xxiv. 14.
  To happen on, to meet with; to fall or light upon. “I have happened on some other accounts.” --Graunt.
  To happen in, to make a casual call. [Colloq.]
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  happen
       v 1: come to pass; "What is happening?"; "The meeting took place
            off without an incidence"; "Nothing occurred that seemed
            important" [syn: hap, go on, pass off, occur, pass,
             fall out, come about, take place]
       2: happen, occur, or be the case in the course of events or by
          chance; "It happens that today is my birthday"; "These
          things befell" (Santayana) [syn: befall, bechance]
       3: chance to be or do something, without intention or
          causation; "I happen to have just what you need!"
       4: come into being; become reality; "Her dream really
          materialized" [syn: materialize, materialise] [ant: dematerialize,
           dematerialize]
       5: come upon, as if by accident; meet with; "We find this idea
          in Plato"; "I happened upon the most wonderful bakery not
          very far from here"; "She chanced upon an interesting book
          in the bookstore the other day" [syn: find, chance, bump,
           encounter]