like a house on fire

/lˈaɪk ɐ hˈaʊs ˌɒn fˈaɪə/

/lˈaɪk ɐ hˈaʊs ˌɑːn fˈaɪɚ/

used to describe a situation or activity that is developing with great intensity, speed, and success

Examples

1. The business started out like a house on fire.

2. I was worried that they wouldn't like each other but in fact they're getting on like a house on fire.

3. These girls are just getting along like a house on fire.

4. We just got on like a house on fire.