(baseball, slang) A double play.

(informal, computing) A killer application.

A person who commits multiple (more than two) murders, especially similar ones with no obvious motive over a period of time with a "cooling-off" period between each murder.

A scullery.

(transitive, idiomatic) To engage in playful fun.

Alternative spelling of killjoy

To grind coarsely.

Something that has been kibbled, especially grain for use as animal feed. / Any artificial animal feed in pellet form.

An iron bucket used in mines for hoisting anything to the surface.

(fandom slang) In the Transformers fandom, pieces of a toy or figure necessary for one mode, but look out of place or unnecessary in the other.