Antonyms for unlock
change:
lock.
contact:
lock.
noun:
tame,
enchain,
smother,
constrain,
control,
govern,
bind,
contain,
bridle,
hamper,
confine,
inhibit,
shackle,
regulate,
restrain,
rein,
manacle,
handcuff,
halter,
hold,
curb,
check,
fetter,
trammel.