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English definition of “flex”

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flex

verb [T] uk   /fleks/ us  
to bend an arm, leg, etc. or tighten a muscle: First, straighten your legs, then flex your feet. He tried to impress me by flexing his huge muscles.

flex

noun [C or U] uk   /fleks/ UK ( US cord) us  
(a length of) wire with a plastic cover used for connecting a piece of electrical equipment to a supply of electricity: The flex on this iron isn't long enough to reach the socket.
(Definition of flex from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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