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bur‧row1

1 [intransitive always + adverb/preposition, transitive] to make a hole or passage in the ground [= dig down]
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]
3 [intransitive always + adverb/preposition] to search for something that is hidden in a container or under other things [= rummage]

Mother turtles burrow into the sand to lay their eggs.