Progressive clue challenge

How quickly can you identify the hidden word?

Begin with a broad grammatical clue. Reveal more only when needed. Fewer clues and fewer wrong guesses produce a higher score.

100
It is used as a verb.
It begins with “P” and contains 7 letters.
Definition: To make smooth or plane, as a metallic surface; to condense, toughen, and polish by light blows with a hammer.
It ends with “H”.
Clue 1 of 4 is visible.
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