He had to curtail his anger

Please curtail your enthusiasm.

We must curtail our trip because it has become to expensive.

To curtail can mean to cut short, or cut off a part of something. For example, to curtail a trip would mean to cut short a trip. A synonym to curtail is to cut back.

curtail means to limit I don't want to stop drinking altogether, I just want to curtail it a bit. Since the economy has plunged, I've had to curtail my non-essential spending. If I don't curtail my eating, I'll have to buy bigger clothes.