He blew out the candles with a wish.

Meaning: This means that he made a wish as he blew out the candles on his birthday cake, hoping that it would come true.

Choice of Words: Blew means to force air out of your mouth. Candles are wicks coated with wax that are lit to provide light. Wish is a desire or hope for something to happen. When you put them together, it means he extinguished the candles on his birthday cake by blowing air on them while making a wish.