blow,
rap, knock, bang, beat, hit, pat
valve,
faucet, spout, spigot, stopcock
stopper,
cork, spigot, plug, bung
rap,
knock, bang, beat, strike, hit, pat, drum
use,
utilize, draw on, draw off, exploit, milk, mine, take advantage of
appoint,
select, nominate, commission, recruit, employ, detail
antonym: pass
over
bug,
listen in on, record, monitor, intercept, eavesdrop on, overhear
draw
off, draw out, extract, run off, milk, release, collect
antonym: block
up