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2 verb
tunnel2 past tense and past participle tunnelled, present participle tunnelling British English, past tense and past participle tunneled, present participle tunneling American English [intransitive always + adverb/preposition, transitive]
1TE to dig a long passage under the ground
tunnel into/through/under
They were tunnelling into the mountainside.
tunnel your way under/through etc
The prisoners tunneled their way under the fence.
2 if insects tunnel into something, they make holes in it
tunnel into
The grubs tunnel into the wood.
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