nut up

nut +‎ up (influenced by expressions like "man up" or "shut up"; "nut" refers to testicles, symbolically implying being more manly)

• IPA^(key): /nʌt ʌp/

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nut up (third-person singular simple present nuts up, present participle nutting up, simple past and past participle nutted up)

1. (intransitive, slang) To show courage and hide one's apprehension.
2. (intransitive, slang) To lose one's temper, go nuts.
   • 2006, Noire [pseudonym], Thug-A-Licious: An Urban Erotic Tale, New York, N.Y.: One World/Ballantine Books, page 103:

     And what if some shit went wrong? Pimp was known to get crazy over minor shit. I didn't know if I could trust him to pull off a job like this without nutting up in the middle of the mix.

• Often used in the imperative form, sometimes in the phrase "nut up or shut up".

• man up
• endure
• put up with
• take lying down

• shut up

• unput