unbrace

verbs

undo the ties of
"They untied the prisoner"
unbrace, unlace, untie
remove from tension
unbrace
is a type of (narrower)
make less taut
"relax the tension on the rope"
relax, unbend
remove a brace or braces from
unbrace
is a type of (narrower)
lessen the strength of
"The fever weakened his body"
weaken