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English definition of “ply”

ply

verb [I + adv/prep, T] (TRAVEL)    /plaɪ/ old-fashioned
When a boat, train, bus, etc. plies a particular route, it makes that journey regularly: High-speed trains regularly ply between Paris and Lyons. This airline has been plying the transatlantic route for many years.Travelling
(Definition of ply verb (TRAVEL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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