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

Crossword clues for Go-ahead signal 10 letters:

GREENLIGHT: Go-ahead signal
NOD: Go-ahead signal
CLEARS: Gives the go-ahead signal.
AOK: Go-ahead signal
AOK: Astronauts' go-ahead signal
NODS: Go-ahead signals