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

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

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

To perform any of the above tests.

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.

To take a motor vehicle on the road to assess its quality before purchase. / (figuratively) To make a preliminary assessment of something through its use.

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

A sample driving session in a motor vehicle, in order to assess its quality before purchase. / (figuratively) Any preliminary assessment of something through use.

(chemistry) A simple test for the acidity or alkalinity of a substance, using litmus paper.

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