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

Crossword clues for Become alert:

HARKS: Becomes alert, say
SNAPTO: Suddenly become alert
SITUP: Become alert
SNAPSTO: Becomes alert
SNAPTO: __ attention (become alert)
SITUP: Become suddenly alert: Colloq.