any of several tests to measure a specific reaction between antigen and antibody which results in a visible precipitate

Any chemical check for the presence of (usually illegal) drugs in a sample of one's blood, hair or urine.

(transitive) To perform a drug test; the check for the presence of illegal drugs in a sample of blood, hair or urine.

A filmed audition to test the screen-acting ability of a potential actor. / (slang) Synonym of rough ride

A test for leaks involving blowing smoke into a tube or pipe.

To perform any of the above tests.

(idiomatic) An informal check of an idea or proposal, using one's common sense or sense of propriety.

A fluoroscopic medical test during which the examinee is asked to "sniff" (quickly breathe in through the nose); diaphragm fluoroscopy.

A measurement performed on motor vehicles, required by the DMV, to prevent issuing valid registration if an excessive amount of waste fumes are produced during typical use. Cars typically are placed on a dynamometer to simulate different driving speeds.

(idiomatic) To test something or someone; to evaluate, scrutinize or explore by testing or experimentation.