D defs.my
Entry 2 senses Webster, 1913

Happen

/(hăp"p'n)/ · Hap·pen · IPA /ˈhæpən/
01 v. i. To come by chance; to come without previous expectation; to fall out.
imp. & p. p. Happened; p. pr. & vb. n. Happening
  1. 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. 2.
    To take place; to occur.
    “All these things which had happened.” — Luke xxiv. 14.
Phrases & compounds
To happen on — to meet with; to fall or light upon.
To happen in — to make a casual call.