happen

v. 1 occur (by chance or otherwise). 2 (foll. By to + infin.) Have the (good or bad) fortune to (i happened to meet her). 3 (foll. By to) be the (esp. Unwelcome) fate or experience of (what happened to you?). 4 (foll. By on) encounter or discover by chance.  as it happens in fact; in reality. [related to *haphazard]

v. i. To come by chance; to come without previous expectation; to fall out.