screw anchor

noun

Definition of screw anchor

  1. 1 :  an anchor in the form of a sharp-pointed screw with broad flanges used principally for moorings

  2. 2 :  an expanding metal shell that wedges itself into a drilled hole upon insertion and is used to retain a screw in material (as concrete, brick, or tile) otherwise unsuitable

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to cast off or become cast off

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