How many letters does the top answer for “to make, or move with, such a sound.” have?

The most common answer is zip (3 letters).

Crossword clue: to make, or move with, such a sound.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

zip 3 letters web-def

close with a zipper