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Definition of tongue and groove noun from the Oxford Advanced Learner's Dictionary

tongue and groove

noun
 
/ˌtʌŋ ən ˈɡruːv/
 
/ˌtʌŋ ən ˈɡruːv/
[uncountable]
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  1. wooden boards that have a long cut along one edge and a long ridge along the other, which are used to connect them together
See tongue and groove in the Oxford Advanced American Dictionary
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