occlude

v. (-ding) 1 stop up or close. 2 chem. Absorb and retain (gases). 3 (as occluded adj.) Meteorol. (of a frontal system) formed when a cold front overtakes a warm front, raising warm air from ground level.  occlusion n. [latin occludo occlus- close up]

v. t. To shut up; to close.