stiffen up (English, verb)
expansion: stiffen up (third-person singular simple present stiffens up, present participle stiffening up, simple past and past participle stiffened up)
Senses:
glosses: To become rigid, tense or stiff.
Forms:
form: stiffens up
tags: present
singular
third-person
form: stiffening up
tags: participle
present
form: stiffened up
tags: participle
past
form: stiffened up
tags: past