do a favor

back benefit bolster boost cooperate encourage further maintain promote push save serve stimulate support

abet accommodate advocate ballyhoo befriend cheer endorse hype intercede patronize plug prop puff relieve sanction second succor sustain uphold

be of use buck up do a service do one's part go to bat for go with lend a hand open doors root for see through stand by stick up for stump for take under one's wing work for

block condemn delay depress discourage dissuade halt harm hinder hurt impede neglect obstruct prevent refuse stop undermine

conceal disapprove frustrate hide ignore oppose protest

check counteract decrease injure worsen