age
antiquate
become extinct
become obsolete
date
fade
fossilize
grow old
hang fire
idle
lose currency
molder
mustiness
obsolesce
outdate
perish
rust
sleep
slumber
smolder
stagnate
superannuate
vegetate
adjust
antitrust
brust
bused
bussed
bust
combust
crust
cussed
discussed
disgust
distrust
dust
encrust
entrust
fussed
gust
hust
incrust
just
lust
mistrust
must
nonplussed
readjust
robust
thrust
trust
unjust