Synonyms for Close Up (same or very similar meaning)
WordNet sense 1 (cease to operate or cause to cease operating):
close, fold, close down, shut downWordNet sense 2 (block passage through):
block, impede, jam, obstruct, occlude, obturateWordNet sense 3 (refuse to talk or stop talking; fall silent):
be quiet, belt up, button up, clam up, dummy up, keep mum, shut upWordNet sense 4 (very close):
at close rangeFrom the ODE community, based on WordNetadd/edit