He tensed his muscles for the fight.
The rope tensed as more weight was added.
Tense the fibers manually.
WordNet 3.0 Sense Numbers: 1, 2
Commentary: Includes: TENSE UP
He tensed up when he saw his opponent.
The phone call really tensed him up.
I tensed upon hearing the verdict.
WordNet 3.0 Sense Numbers: 3, 4
WordNet Verb Particle Constructions, Multiword Expressions:
tense_up 1, 2