peg someone

peg (one) as (something)

To believe or consider that one definitely is a certain type of person or thing. I pegged her as a total bore when she first started working here, but since getting to know her, she's actually pretty interesting. I'm disappointed, Jake—I never pegged you as a quitter.
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peg someone

tv. to gossip about someone. Kim is always pegging Jill. What’s her problem?
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References in periodicals archive ?
It is tough to peg someone as a letdown when he plays a position that generally gives nothing.