fine-tooth comb

US /ˈfaɪn.tuːθ ˌkoʊm/
UK /ˈfaɪn.tuːθ ˌkoʊm/
"fine-tooth comb" picture
1.

a comb with teeth that are very close together, used for removing lice and nits from hair

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She used a fine-tooth comb to check her daughter's hair for head lice.
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The nurse recommended a fine-tooth comb for effective nit removal.
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nit comblice comb
1.

to examine something very carefully and thoroughly

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The police went over the crime scene with a fine-tooth comb.
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We need to go through the contract with a fine-tooth comb before signing.
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thoroughlymeticulouslycarefullyexhaustivelyclosely
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go over/through something with a fine-tooth combcombcombativetoothfinefinelycomb binding