godan verb (-mu), intransitive verb
Describes sliding or slipping into a space, often with a sense of barely making it in time or squeezing in. Common in sports (sliding into a base) and in everyday situations like slipping into a seat or just catching a train.
彼はベースに滑り込んだ。
He slid into the base.
電車のドアが閉まる直
I slipped in just before the train doors closed.