Answer: tensedup

AnswerCrossword Clue
TENSEDUP

Stiffened

TENSEDUP

Got edgy

TENSEDUP

Choked, so to speak

TENSEDUP
Got nervous
TENSEDUP
Felt butterflies
TENSEDUPTaut
TENSEDUPStarted to freeze
TENSEDUPBecame antsy