Tense up has 3 different meanings across 1 category:
Verb
Verb
1
become tense, nervous, or uneasy
"He tensed up when he saw his opponent enter the room"
2
cause to be tense and uneasy or nervous or anxious
"he got a phone call from his lawyer that tensed him up"
Broader Terms (hypernyms)
Narrower Terms (hyponyms)