"stiffening" in the noun sense
1. stiffening
the act of becoming stiff
"stiffening his shoulders, he prepared to advance"
2. stiffening, rigidifying, rigidification
the process of becoming stiff or rigid
"stiffening" in the verb sense
1. stiffen
become stiff or stiffer
"He stiffened when he saw his boss enter the room"
2. stiffen
make stiff or stiffer
"Stiffen the cream by adding gelatine"
3. stiffen, tighten, tighten up, constrain
severely restrict in scope or extent
"tighten the rules"
"stiffen the regulations"
Source: WordNet® (An amazing lexical database of English)
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