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English to English verb
| 1 |
become stiff or stiffer |  | Example: He stiffened when he saw his boss enter the room
source: wordnet30
| 2 |
make stiff or stiffer | | Example: Stiffen the cream by adding gelatine
source: wordnet30
| 3 |
restrict | | Example: Tighten the rules
stiffen the regulations
source: wordnet30
| 4 |
To make stiff; to make less pliant or flexible; as, to stiffen cloth with starch. | | source: webster1913
| 5 |
To become stiff or stiffer, in any sense of the adjective. | | source: webster1913
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