(mathematics, somewhat informal) Proof in stages, each of which, in general, depends on the previous stages and can be visualized by means of a diagram of morphisms.

(transitive, idiomatic) To drive someone or something away.

To pursue, so as to attempt to capture; used with to.

(slang) To inhale the vapour from heated morphine, heroin, oxycodone or opium that has been placed on a piece of foil.

present participle of chase rainbows

(idiomatic) To pursue unrealistic or fanciful goals.

(music) A musical instrument (idiophone) made from a split stalk of bamboo struck against a performer's hand, originating in South Asia.

(derogatory) The action of an ambulance chaser.

(games) A children's game similar to tag, the object being for the person who is "it" to catch and kiss another of the participants, who then subsequently becomes "it".

(idiomatic) To get to the point; to get on with it; to state something directly.