Answer: tensedup

AnswerCrossword Clue
TENSEDUPStiffened
TENSEDUPGot edgy
TENSEDUPChoked, so to speak
TENSEDUPGot nervous
TENSEDUPFelt butterflies
TENSEDUPTaut
TENSEDUPStarted to freeze
TENSEDUPBecame antsy