Snift"ing, a. & n. from Snift.
Snifting valve, a small valve opening into the atmosphere from the
cylinder or condenser of a steam engine, to allow the escape of air
when the piston makes a stroke; -- so called from the noise made by its
action.
Snig (?), v. t. [See Snick a small cut.] To chop off; to cut. [Prov.
Eng.]