·vt To make torpid; to Benumb.
II. Stiffen ·vi To become stiff or stiffer, in any sense of the adjective.
III. Stiffen ·vt To make stiff; to make less pliant or flexible; as, to stiffen cloth with starch.
IV. Stiffen ·vt To Inspissate; to make more thick or viscous; as, to stiffen paste.