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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Be nervous: Slang. 6 letters:

JITTER: Act nervous: Slang.
JITTER: Be nervous: Slang.
JITTERER: Nervous one: Slang.
JITTERS: Nervous feeling: Slang.