Crossword clues for the word: MACHI The word MACHI has appeared as an answer to at least 11 crossword clues on different crossword puzzles. Crossword clues for MACHI Showing 1 to 11 of 11 results Clue(s) A certain speed of sound. Barrier-breaking speed Booming speed Chuck Yeager goal? Chuck Yeager's breakthrough It's roughly 761 MPH Military specialist Speed exceeded by SSTs Speed of sound (CHAIM anagram) Speed-of-sound term. Yeager's breakthrough