1 [intransitive always + adverb/preposition, transitive]
to make a hole or passage in the ground [= dig down]
burrow into/under/through etc
Mother turtles burrow into the sand to lay their eggs.
2 [intransitive,transitive always + adverb/preposition]
to press your body close to someone or under something because you want to get warm or feel safe [= nestle]
burrow into/under/down etc
The child stirred and burrowed deeper into the bed.
burrow something into/against etc something
She burrowed her head into his shoulder.
3 [intransitive always + adverb/preposition]
to search for something that is hidden in a container or under other things [= rummage]
burrow in/into/through etc
Helen burrowed in her bag for a handkerchief.