ensure
vow
engage
undertaking
oath
promise
assure
a promise made is a promise kept
propine
pass one's word
pledging
pledgor
avow
pledger
plight
handfast
stipulate
votive
give
promissory
promisee
vowmaking
pledgee
votary
word of honor
promising
pledge
commitment
commissive
word
promiser
promisor
parole
euche
dedication
swear down
pinky promise
good as one's word
covenant
nercha
pledgeling
promissive
token
avower
swear
acknowledgment
acknowledgement
promisable
assumpsit
deliver the goods
swear on a stack of Bibles
give one's word
hypothecate
committed
make good
repledge
pass
hand
consideration
resolution
affirming
profess
vum
pledget
fake the funk
give up the ghost
interpledge
guaranteed
if I'm lying, I'm dying
so help me God
guarantee
belly up to the bar
repledger
mispromise
exchange vows