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firm up

VERB
stabilize
Synonyms
STRONGEST
balance fix maintain preserve secure steady sustain
STRONG
ballast bolt brace buttress counterbalance counterpoise equalize fasten firm freeze ossify poise prop set settle stiffen support uphold
WEAK
stabilitate
Antonyms
STRONGEST
destroy forget hurt ignore neglect
STRONG
drop fall let down let go liquefy loosen melt open release soften unfasten unlock weaken
WEAK
change shake vary wobble

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.