Loudmouth, be a

Also:
Have a loud mouth

Meaning of Idiom ‘Loudmouth’

A loudmouth is a person who talks too loudly, often boastfully, offensively and continually; one who talks indiscreetly; a gossip. 1Pare, May. Body Idioms and More: For Learners of English. United States?: Mayuree Pare, 2005.,2Ammer, Christine. American Heritage Dictionary of Idioms. Boston: Houghton Mifflin Harcourt, 2013.,3Cambridge Academic Content Dictionary.  Cambridge University Press, 2007.

Compare big mouth.


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Usage

A person can be a loudmouth or have a loud mouth. Both describe the same type of person.

Examples Of Use

“I couldn’t sleep at all last night. I could hear the loudmouth in the next hotel room through those thin walls. I thought he’d never stop!”

“Nobody likes my sister’s boyfriend. He’s such a loudmouth!”

“If you stop being such a loudmouth you’ll get along with people better. Stop trying so hard to fit in.”

“Larry says he has a loud mouth when he drinks. He must always be drunk, then!”

Origin

Used since the late 1800s. 4Ammer, Christine. American Heritage Dictionary of Idioms. Boston: Houghton Mifflin Harcourt, 2013.

More Idioms Starting with L

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Sources   [ + ]

1. Pare, May. Body Idioms and More: For Learners of English. United States?: Mayuree Pare, 2005.
2, 4. Ammer, Christine. American Heritage Dictionary of Idioms. Boston: Houghton Mifflin Harcourt, 2013.
3. Cambridge Academic Content Dictionary.  Cambridge University Press, 2007.