flex

1. to bend, as a part of the body:

   He flexed his arms to show off his muscles.

2. to tighten (a muscle) by contraction.
3. to demonstrate (one’s ability, expertise, etc.):

   She’s flexed her marketing skills for various clients in the publishing industry.

4. Slang. to boast or brag about; flaunt:

   He’s just not into flexing his success.

1. to bend.
2. Slang. to boast or brag; show off:

   In his rap lyrics he flexes about his fancy lifestyle.

1. the act of flexing.
2. Slang. a boast or brag:

   It's not a flex, but we have the best burgers here.

3. British.
   1. any flexible, insulated electric cord; an electric cord or extension cord.
   2. Slang. an elastic band, as a garter.
4. Mathematics. an inflection point.

verb phrase

1. Slang. to brag or show off to; assert one’s dominance or superiority over:

   She’s flexing on her haters by posting new photos of her beautiful family.

1. Informal. flexible:

   a flex program of workers' benefits.

1. a combining form representing flexible in compound words:

   flextime.