Definition of "Tense" :
noun: a grammatical category of verbs used to express distinctions of time
verb: cause to be tense and uneasy or nervous or anxious
"He got a phone call from his lawyer that tensed him up."
verb: become tense, nervous, or uneasy
"He tensed up when he saw his opponent enter the room."
verb: increase the tension on
"Alternately relax and tense your calf muscle."
verb: become stretched or tense or taut
"The bodybuilder's neck muscles tensed."
adjective: taut or rigid; stretched tight
"Tense piano strings."
adjective: pronounced with relatively tense tongue muscles (e.g., the vowel sound in beat')
adjective: in or of a state of physical or nervous tension