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

Crossword clues for Start of a football game:

DOAFLIPACOINAPHRASE: Somersault / Start football game / Invent some language
TEEUP: Prepare to start a football game
KICKSOFF: Starts the football game
KICKOFF: Start of a football game
TOSS: Start of a football game
COIN: It's tossed at the start of a football game
COIN: With 42-Across, starts of pro football games