fumble the bag
own goal
cook someone's goose
muck up
blow one's chance
cruel
be one's own worst enemy
underminingly
give him enough rope and he'll hang himself
soil
self-sabotage
destroy
career suicide
take at advantage
come to grief
ruin
burn one's bridges
ball up
strike
eschewance
spoil
hara-kiri
shit in someone's Cheerios
vitiate
professional suicide
kamikaze
blow up
blow up in one's face
stuff up
self-annihilate
disaster
reap the whirlwind
break
smash
tickle the dragon's tail
fashous
undo
underminer
wreck
mislead
crab
undergrub
undercut
stand in one's own light
blight
run afoul of
untime
cut someone's throat
misreliance
bitch
self-abuse
refringe
backfire
self-deprivation
non-starter
blow
burn one's fingers
doomward
stultify
bewill
self-seeking
give someone a hard time
bedash
frustration
foiling
thwarting
self-defeating
cut bait
self-destruction
ruinable
make shit of
fight a losing battle
shoot one's load
cuck
malice
banjax
run into the ground
self-destruct
blow one's load
botch up
mug's game
saw off the branch one is sitting on
blemish
poop on
pay the price
spell doom
rod for one's back
shit up
eviscerate
advantage
blunder
abandonment
shoot oneself in the foot
cut off one's nose to spite one's face
put out of one's misery
shatterable