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counterbore [counterbores]▼(recess-machining tool)noun[UK: kˈaʊntəbˌɔː] [US: kˈaʊntɚbˌoːr]
countersink [countersinks]▼(a conical recess machined around a hole)noun[UK: ˈkaʊn.tə.sɪŋk] [US: ˈkaʊn.tə.sɪŋk]
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