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Noun: put-put  'pút'pút
Usage: informal
  1. A small petrol engine (as on motor boat)
    "The put-put of the small boat engine echoed across the lake"
Verb: put-put (put-putted,put-putting)  'pút'pút
Usage: informal
  1. Make a repetitive sound like a small engine
    "The old motor put-putted down the road"

Derived forms: put-puts, put-putted, put-putting

Type of: gasoline engine [N. Amer], petrol engine [Brit]