happen

[1]	occur , hap , go on , take place , come about , pass off , occur , go on , come to pass , pass , fall out , develop , betide , come about , take place , chance , prove , materialize , (Colloq) transpire , come off , (Slang) cook
[2]	befall , befall , bechance , become of
[3]	happen on/upon , come upon , chance/hit on/upon , stumble on/upon , find , turn up , encounter , meet with
[4]	materialize , materialise
[5]	find , chance , bump , encounter