tense up

Verb
  1. Become tense, nervous, or uneasy (synset 200026146)
    "He tensed up when he saw his opponent enter the room"
    is a type of: change state, turn - undergo a transformation or a change of position or action
    same as: tense
  2. Cause to be tense and uneasy or nervous or anxious (synset 200025196)
    "he got a phone call from his lawyer that tensed him up"
    causes: tense, tense up - become tense, nervous, or uneasy
    is a type of: affect - act physically on; have an effect upon
    subtypes: extend, stretch - extend one's limbs or muscles, or the entire body
    same as: strain, tense

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