say a mouthful
to say a lot of true and important things about something in a few words

[TahlilGaran] Dictionary of Contemporary English ▲

say a mouthful
to say something of great importance or meaning, to say a lot; to say something of great importance/meaning/length
The little boy said a mouthful when he talked about the history material.

"You certainly said a mouthful," I said when my friend began to tell me about his complaint.

[TahlilGaran] English Idioms Dictionary ▲

say a mouthful
1. v. phr., slang To say something of great importance or meaning; say more by a sentence than the words usually mean.
■ Usually in past tense.
Tom said a mouthful when he guessed that company was coming to visit. A dozen people came.
2. v. phr., informal To vent one's honest opinion, even in anger.
He sure said a mouthful when he told his boss what was wrong with our business.
Antonym: GET AN EARFUL.

[TahlilGaran] English Idioms Dictionary ▲