1. (noun) countersink
a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface
Synonyms: countersink bit, counterbore
2. (verb) counterbore, countersink, countersink bit
a bit for enlarging the upper part of a hole
Synonyms: countersink bit, counterbore, countersink
3. (verb) set, countersink
insert (a nail or screw below the surface, as into a countersink)
Synonyms: plant, go under, dress, place, prepare, mark, put, localize, coiffe, fix, fructify, gear up, go down, jell, position, arrange, define, specify, lay, correct, countersink, do, determine, coiffure, lay out, coif, ready, set up, congeal, sic, limit, set, typeset, adjust, rig, pose, localise
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Synonyms for countersink 
