Exact Match:
- stiffen
- make stiff or stiffer; "Stiffen the cream by adding gelatine"
- become stiff or stiffer; "He stiffened when he saw his boss enter the room"
- restrict; "Tighten the rules"; "stiffen the regulations"
Synonyms:
- amplify,
- back,
- be tough,
- beef up,
- brace,
- brace up,
- buttress,
- case harden,
- charge,
- clot,
- coagulate,
- confirm,
- congeal,
- crystallize,
- electrify,
- endure,
- energize,
- fortify,
- galvanize,
- generate,
- gird,
- hang tough,
- harden,
- invigorate,
- jell,
- loop in,
- nerve,
- plug in,
- prop,
- refresh,
- reinforce,
- reinvigorate,
- restrengthen,
- rigidify,
- screw up,
- set,
- shock,
- shore up,
- short,
- short-circuit,
- solidify,
- steel,
- step down,
- step up,
- strengthen,
- support,
- sustain,
- switch off,
- switch on,
- tauten,
- temper,
- tense,
- thicken,
- tighten,
- toughen,
- trice up,
- turn off,
- turn on,
- undergird