My coworkers' big mouths ruined the surprise party.

She bad-mouths her colleagues behind their backs even though she praises them in meetings.

A smash-mouth clash broke out between the rival crews outside the bar.

His dirty mouth got him into trouble at the family dinner.

The broad-mouthed fish snapped up the bait before anyone could react.

I bought a new mouth wash that promises fresher breath all day.

The entomologist examined the insect's mouth-part under the microscope.

The entomologist carefully examined the beetle's mouth-parts under the microscope.

Despite the sunny weather, Tom was down in the mouth all afternoon.

The hikers complained that the mouth-breathers behind them were slowing the group down with their constant gasps.