ˈkləʊ.ʒə(ɹ) ˈkloʊ.ʒɝ stɒp stɑp the act of blocking an obstruction in a pipe or tube we had to call a plumber to clear out the blockage in the drainpipe (dentistry) the normal spatial relation of the teeth when the jaws are closed (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft closure or blockage (as of a blood vessel)