How many letters does the top answer for “blow or breathe hard on or into” have?

The most common answer is insufflate (10 letters).

Crossword clue: blow or breathe hard on or into

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

insufflate 10 letters wn-def

blow or breathe hard on or into

a hard blow. halliwell. 50% similar → siserara, siserary

blow hard and loudly 50% similar → chuff, huff

deliver a hard blow to 50% similar → smack, thwack