be efficacious (verb) take: win; be successful
Sinonime: backtalk,
block, bollix,
buck, crab, cramp, crimp,
deny, double-cross, flummox,
foil, foul up,
frustrate, have bone to pick,
impede,
interfere, knock props out, louse up,
obstruct,
oppose,
resist, sell out,
sell*, snafu, stab in the back, stonewall, stump,
stymie,
take on, take wind out of sails,
thwartAntonime: abet,
aid,
assist,
help