潜もぐり込こむ

godan verb (-mu), intransitive verb

slip into; crawl into; conceal oneself under

Physical action of entering a tight or covered space, often by crawling or squeezing in. Can also imply hiding oneself under something.

• 布ふ団とんにもぐりこんで寝ねた。

  I slipped into the futon and slept.

• 猫ねこがソファの下したにもぐりこんだ。

  The cat crawled under the sofa.

godan verb (-mu), intransitive verb

sneak into; infiltrate

Entering a place or group secretly, often with a purpose such as spying or gaining unauthorized access.

• スパイが敵てきの組そ織しきにもぐりこんだ。

  A spy infiltrated the enemy organization.

• 彼かれはパーティーにもぐりこんで、有ゆう名めい人じんに会あった。

  He sneaked into the party and met a celebrity.