The clue "Engine knock" last appeared in the Universal crossword on September 27, 2016. The correct answer for this puzzle is "PING", a 4-letter word.
Solution PING is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is PING with 4 letters, and the shortest is PING with 4 letters.
No, "ENGINE KNOCK" hasn´t seen a spike right now. Solvers are most interested in: Craft knife brand, Upset, Bizarre, Levy and nascency.
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The solution is 4 letters long.