upsets the apple cart (verb) balk: thwart
Sinonime: baffle,
bar,
beat,
check,
circumvent,
counteract, cramp, cramp one's style,
dash,
defeat,
disappoint,
disconcert,
foil, forestall,
frustrate,
hinder,
obstruct,
prevent,
ruin,
stall,
stop, throw a curve, throw monkey wrench in, upset the apple cart
Antonime: aid,
help, make easier