転ころがり込こむ

godan verb (-mu), intransitive verb

roll in; tumble into; come to stay (uninvited)

Describes something or someone rolling or tumbling into a place, or a person showing up and staying overnight, often as an unwanted guest. Also used when someone comes to live with another person, often implying a sudden or unplanned move.

• ボールが庭にわに転ころがり込こんだ。

  A ball rolled into the garden.

• 友とも達だちが突とつ然ぜん家いえに転ころがり込こんできた。

  A friend suddenly showed up at my house and stayed over.

godan verb (-mu), intransitive verb

fall into one's lap; come one's way unexpectedly

Used for opportunities, luck, or things arriving without effort, as if they rolled into one's possession.

• 思おもわぬ仕し事ごとが転ころがり込こんできた。

  An unexpected job came my way.