noun
a dull, metallic sound
verb
to pluck or hit a stringed instrument with a quick, sharp motion
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The musician plunked the keys of the grand piano with precision.
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I like to plunk around on my guitar when I'm bored.
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Let's plunk down on the couch and watch a movie.
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The decision to plunk down a large sum of money on a new car was a risky move.