grubscrew

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• grubscrew — /ˈgrʌbskru/ (say grubskrooh) noun → setscrew …  

• setscrew — /ˈsɛtskru/ (say setskrooh) noun a screw, headless and with a cylindrical thread, which holds together two machine parts, one being otherwise subject to movement along the other. Also, grubscrew …