knife up
Advanced (C1)slang
To attack someone with a knife, or to get knives ready.
"The report said the victim had been knifed up during the altercation outside the club."
Hear it in context

Key Giveaways! | Intel Plays Cooking Simulator 2
Intel Gaming · 125:52
Put my knife up.

IRL Chef Stream - Live Butchery For a Restaurant
Fallow · 71:11
literally I just take my knife up there.

Being Iranian-American in the Deep South | Short Documentary
PBS Documentaries · 1:04
But when they bury that knife up, get an organ, dump their guts.

Brene Brown on resentment...wow!
Matthias J Barker · 1:01
and so there's a knife up against my throat but I'm holding it

Important Cooking Skills With Gordon Ramsay
Gordon Ramsay · 7:43
of the loin of pork come back down in towards the bone turn the knife up