Dumped in one's lap - Idioms by The Free Dictionary
dump (something) in (someone's) lap (redirected from dumped in one's 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.
drop/dump something in somebody’s ˈlap (informal) make something the responsibility of another person: They dropped the problem firmly back in my lap.