The clue "Machine sound" last appeared in the Thomas Joseph - King Feature Syndicate crossword on October 4, 2017. The correct answer for this puzzle is "HUM", a 3-letter word.
Solution HUM is 3 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is HUM with 3 letters, and the shortest is HUM with 3 letters.
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The solution is 3 letters long.