tomber dans les pommes

to faint

This expression means to lose consciousness or faint.

Avec cette chaleur, plusieurs personnes sont tombées dans les pommes.

With this heat, several people passed out.

Probably evolved from the 19th-century 'tomber en pames' (to swoon). 'Pames' gradually became 'pommes' (apples), likely through mishearing. Another theory traces it to George Sand's phrase 'être dans les pommes cuites' (to be in cooked apples), meaning extreme fatigue.