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.
布団にもぐりこんで寝た。
I slipped into the futon and slept.
猫がソファの下にもぐりこんだ。
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.
スパイが敵の組織にもぐりこんだ。
A spy infiltrated the enemy organization.
彼はパーティーにもぐりこんで、有名人に会った。
He sneaked into the party and met a celebrity.