Definitions for "Stiffen"
Keywords:  stiffer, boss, gelatine, adjective, saw
To become stiff or stiffer, in any sense of the adjective.
become stiff or stiffer; "He stiffened when he saw his boss enter the room"
make stiff or stiffer; "Stiffen the cream by adding gelatine"
Keywords:  benumb, torpid
To make torpid; to benumb.
Keywords:  inspissate, viscous, thick, paste
To inspissate; to make more thick or viscous; as, to stiffen paste.
Keywords:  pliant, starch, flexible, cloth, less
To make stiff; to make less pliant or flexible; as, to stiffen cloth with starch.
restrict; "Tighten the rules"; "stiffen the regulations"