How many letters does the top answer for “to curdle, as milk.” have?

The most common answer is earn (4 letters).

Crossword clue: to curdle, as milk.

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

earn 4 letters web-def

earn on some commercial or business transaction; earn as salary or wages

yearn 5 letters web-def

desire strongly or persistently

to curdle; to coagulate, as milk. holland. 50% similar → quail