From Longman Dictionary of Contemporary Englishlucky dipˌlucky ˈdip noun British English 1 [countable]DGO a game in which you put your hand into a container filled with small objects, and choose one without looking SYN grab bag American English2 [singular]CHANCE/BY CHANCE a situation in which what happens depends on chance SYN lottery
Examples from the Corpus
lucky dip• A good lucky dip, to please the sixes and upwards.• The pundits dip haphazardly into the lucky dip. 