cook someone's goose
fumble the bag
cruel
drive a coach and horses through
self-sabotage
cut the ground from under someone's feet
sell out
overpet
discomfit
fail at life
rain on one's parade
cut bait
overkill
mismotivate
blunk
ruin
take the wind out of someone's sails
be one's own worst enemy
blow one's chance
saw off the branch one is sitting on
backfire
dash someone's hopes
stand in the way
flog a dead pony
flog a dead horse
overpersuade
scotch
cast a pall
sell
put a crimp in
not win for losing
cut one's own throat
advantage
shoot oneself in the foot
take the bread out of someone's mouth
bungle
immiserate
cross someone's path
paint oneself into a corner
pay the fiddler
be riding for a fall
eat one's young
shit in someone's Cheerios
egg on
box oneself into a corner
cajole
run a risk
bitch
blight
reap the whirlwind
toy with
back the wrong horse
harsh one's mellow
stymie
neglect
get ideas
play false
bamboozle
destroy
kick
hoodwink
lead by the nose
blow one's load
see one's way clear to
snow
shoot one's load
pay the price
pull the wool over someone's eyes
disappoint
pitch
fall back