Pronunciation: /klɛntʃ ʌp/
noun a verb used to describe the action of tightening or contracting muscles, typically in response to stress or tension
A1 When I get nervous, I tend to clench up my fists.
A2 The child's teeth were chattering and he began to clench up his jaw.
B1 During the intense scene, the actor's whole body started to clench up.
B2 The stress of the situation caused her to clench up her entire body, unable to relax.
C1 The athlete's muscles automatically clench up in preparation for the upcoming race.
C2 She could feel her heart racing and her muscles clenching up as she prepared to speak in front of the large audience.
formal The patient began to clench up as the doctor approached with the needle.
informal I always clench up when I watch scary movies.
slang I could feel myself starting to clench up during the intense scene.
figurative Her heart seemed to clench up with fear as she heard the news.
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