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1. To bend. (

2. Cause (a muscle) to stand out by contracting or tensing it. (Google Dictionary)

3. Contract or be tensed. (Google Dictionary)

4. To repeatedly bend one of one’s joints. (

5. To move part of the body using one’s muscles. (

6. To bend; to move a joint in such a direction as to approximate the two parts which it connects. (

Noun, pl. flexes

1. The action or state of flexing

Word origin: Latin flexus, past participle of flectere (“to bend”).

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