Superstitious words of encouragement, and a clue to 17-, 25-, 54- and 64-Across

Crossword clues for Superstitious words of encouragement, and a clue to 17-, 25-, 54- and 64-Across:

BREAKALEG: Superstitious words of encouragement, and a clue to 17-, 25-, 54- and 64-Across