n.1 the act or an instance of sucking.
2 a the production of a partial vacuum by the removal of air etc. in order to force in liquid etc. or procure adhesion. b the force produced by this process (suction keeps the lid on).
Phrases and idioms:
suction-pump a pump for drawing liquid through a pipe into a chamber emptied by a piston.
Etymology: LL suctio f. L sugere suct- SUCK