"toothcomb : (Britain, figurative, sometimes proscribed) A comb with finely spaced teeth, chiefly as..."

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toothcomb : (Britain, figurative, sometimes proscribed) A comb with finely spaced teeth, chiefly as a metaphorical means of making a thorough search. […]
(zoology) A comb-like dental structure found in certain primates consisting of long, flat front teeth with microscopic grooves, which are used for grooming fur. […]
toothcomb v

(Britain, transitive, figurative, sometimes proscribed) To search (something) thoroughly.

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- https://en.wiktionary.org/wiki/toothcomb#English

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