Say a mouthful (idiom): It is an informal expression meaning to say something very important or meaningful using only a few words.

Hello Safaa, "to say a mouthful" means either to say a lot or to say something very important and meaningful". Example: " When you said things were busy around here, you said a mouthful.It is really very busy." " You really said a mouthful" You said exactly what needed to be said.; What you said was very meaningful and had great impact.

Those few words were as good as a mouthful of words.

Hello In just few words you say exactly what people think too...