___ 1 (speed of sound)
The crossword clue "___ 1 (speed of sound)" is answered by MACH, a 4-letter entry. Used 21 times across 13 distinct years; most recently in 2026; first recorded in 2004. It appears in 11 publications in the xd corpus.
The answer
MACH
4 letters. See every clue for this answer on the MACH answer page.
Used 21 times across 13 distinct years; most recently in 2026; first recorded in 2004. It appears in 11 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for MACH
Every other clue in this collection answered by MACH, most used first.
- Speed-of-sound word - used 25 times, most recently in 2025
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Canyon sound - ECHO, used 202 times
- Throat-clearing sound - AHEM, used 180 times
- Scissors sound - SNIP, used 135 times
- High-five sound - SLAP, used 132 times
- Horn sound - TOOT, used 132 times
- Attention-getting sound - PSST, used 120 times
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