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English definition of “ply”

ply

noun [U]  /plɑɪ/ us  

ply noun [U] (LAYER)

a layer of something such as wood or paper, or a thread that is wrapped with other threads to form yarn (= wool cord) or rope: two-ply facial tissue

ply

verb  /plɑɪ/ us  

ply verb (WORK)

[T] to work at something regularly: New buses plied the city's bus routes this week. Extreme-sports athletes ply their craft (= their skill or job) in especially difficult conditions.

ply verb (TRAVEL)

[I/T] to travel over distances regularly by boat or other form of transport: [T] Large numbers of vessels plied the waters between New York and Cape Hatteras.
(Definition of ply from the Cambridge Academic Content Dictionary © Cambridge University Press)
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