drop/dump something in somebody's lap

drop (something) in (someone's) lap

To give to or force upon someone suddenly and unexpectedly. When Steve won the lottery, we suddenly had the chance to travel the world dropped in our laps. Our son dropped his student debt in our laps when he lost his job last year.
See also: drop, lap

dump (something) in (someone's) lap

To foist something onto someone else, usually some task or responsibility. Yep, management dumped that big project in my lap after Lydia resigned.
See also: dump, lap

drop/dump something in somebody’s ˈlap

(informal) make something the responsibility of another person: They dropped the problem firmly back in my lap.
See also: drop, dump, lap, something