is tensing
Present progressivehe/sheconjugation oftense.

tense

You know, your voice is tensing up.
Tú sabes, tu voz se está tensionando.
I said earlier to someone that if he regulates his speed it shows that he is tensing his muscles.
Le dije a alguien anteriormente que si regulara su velocidad se demostraría que está tensando sus músculos.
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