mouthful Идиома
say a mouthful
say something of great importance or meaning or length He really said a mouthful yesterday when he made the announcement about his new job.
say a mouthful|mouthful|say
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.
mouthful
mouthful see
say a mouthful.