Антонимом open up

slow down block cease cheque check delay discourage halt hinder slow stop dissuade repress wait decelerate defer impede postpone retard

clam up conceal confine aid be immune combine close bear fold up abridge coagulate ask detain deny roll up assist contradict cover hide solidify be quiet fail compress deceive conclude unite create cure decrease complete destroy free decline disavow worry hold benefit heal disagree freeze harm disown help end give keep diminish secret secrete imprison refuse let go dispute lessen fix suppress die hurt finish withhold take back limit lower lose increase disallow protect ruin learn rise narrow veil withdraw restrain keep secret disapprove mend miss listen retain backfire reject question shrink renounce close up improve misunderstand kill repudiate dissent not mention concentrate misguide prevent ignore walk offer condemn bind restrict neglect mislead raise release appease erase unsettle invalidate blame effect surrender sew charge extract result not touch obscure pass up subtract terminate protest tap convict take away veto oppose fasten be vague abjure estimate bewilder incarcerate figure disregard confound incriminate guess forswear confuse sentence delude collect puzzle argue gather maintain differ object sell confute debar dismiss eject exclude expel gainsay oust repel shut