affirm
afford support
attest
authenticate
back
back up
bear
bear out
bear up
bed on
beef up
bolster
bolster up
bottom on
brace
brace up
build on
buoy up
buttress
carry
case harden
certify
circumstantiate
confirm
corroborate
cradle
crutch
cushion
document
finance
fortify
found on
fund
gird
give support
ground on
harden
hold
hold up
invigorate
keep
keep afloat
keep up
lend support
mainstay
maintain
nerve
pillow
probate
prop
undergirt
strengthen
support
undergirded
undergirding
undergirds
undermine