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Flex

/fleks/

Verb

1. To bend. (wikipedia.org)

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. (wiktionary.org)

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

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

Noun, pl. flexes

1. The action or state of flexing

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