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Use "countersinking" in a sentence
"I drilled larger holes to hide the screw heads; this is called countersinking the screws."
"As far as countersinking or not under the head of an attachment, that should be covered in the “process standards”, under the “hole preparation” section."
"Auntie Joy scurried by with a nail gun and plucked up two cans of Diet Sprite on the run, tossing one to George Perry, who paused in the countersinking of Sheetrock screws for a cold drink."