નાને મહોંડે મોટી વાત.

nānē mahōṁḍē mōṭī vāta.

Literally: Big talk from a small mouth.
What it means: This is used when someone speaks beyond their age, status, or capability.

કહેવત સમુદાય (Kahevat Samuday) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.