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Synonyms for back out of
verb change mind

reconsider
renege
take back
change opinion

default on
do a U-turn
do an about-face
fail to honor

go back on
go into reverse
have second thoughts
sing a different song

shift one’s ground

Synonyms
verb declare null and void

quash
invalidate
annul
revoke
reverse
void
dismantle
abolish

cancel
lift
renege
retract
abrogate
overturn
repeal
scrub

forget
recall
remove
countermand
nix
backpedal
call off
set aside

X-out
backwater
crawl out of
pull the plug
wangle out
weasel out

Antonyms

permit
sanction
validate
enforce
institute

legalize
ratify
uphold
allow
support

approve
keep
enact
establish

Synonyms
verb take back; renege on

deny
repeal
revoke
reverse
renounce
repudiate
disavow
rule out
renege
back down
take back
withdraw

cancel
back off
recant
disown
rescind
suspend
welsh
recall
abjure
recede
back
countermand

disclaim
eliminate
forswear
retrograde
exclude
sheathe
retreat
call off
fall back
pull in
retrocede
take in

pull back
unsay
draw in
forget it
go back on
have change of heart
nig
reel in
change one’s mind
eat one’s words

Antonyms

sanction
enforce
permit
include
welcome
corroborate

emphasize
repeat
acknowledge
admit
agree
allow

approve
go forward
advance
forge
accept
reaffirm

Synonyms
verb take back; cancel

quash
invalidate
deny
annul
reverse
renounce
void
dismiss
dismantle
remove
abolish

nullify
retract
lift
withdraw
vacate
abrogate
repeal
rescind
obliterate
scrub
expunge

repudiate
recall
abjure
backpedal
countermand
disclaim
nix
erase
forswear
negate
disown

recant
call back
call off
rub out
wipe out
set aside
counterorder
declare null and void

Antonyms

permit
sanction
validate
affirm
corroborate
remain
institute
legalize
ratify

construct
create
claim
enforce
allow
support
approve
keep
fix

stay
enact
establish
pass
build
admit
accept
acknowledge
authorize

Usage Notes

Although some object to their use, the phrases in back of and the shorter—and much older—back of with the meaning “behind” are fully established as standard in American English: The car was parked (in) back of the house. Both phrases occur in all types of speech and writing.