definition of
knife

[1] #1 knife n. edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle. wn

[2] #2 knife n. a weapon with a handle and blade with a sharp point. wn

[3] #3 knife n. [tongue] any long thin projection that is transient; "tongues of flame licked at the walls"; "rifles exploded quick knives of fire into the dark". wn

[4] #4 knife v. [stab] use a knife on; "The victim was knifed to death". wn