She likes to bad-mouth her ex-boyfriend.

She bad-mouthed her ex-boyfriend to all her friends.

The smash-mouth style of play in football can lead to intense physicality on the field.

Word-of-mouth is a powerful marketing tool.

He has a dirty mouth.

The broad-mouthed frog caught a fly with ease.

The insect has specialized mouth-parts for feeding.

The insect uses its mouth-part to feed on nectar.

I need to buy some mouth wash.

There were a few mouth-breathers in the crowd.