stiffen Synonyms

tighten up constrain tighten make stiff toughen toughening toughened tightening thicken thickening thickened tense strengthen stiffener stiffening steel vitrify rigidification tense up become stiff become rigid go rigid tensing tauten starken rigidify tensed ice over gel stabilize firm up fossilise starch solidify solidifying firm encrust curdle crystallize congeal condense concreted coagulate clot clabber calcify caking cake brace fix