પોતાની જંગ ઉઘાડીએ તે નાગા જણાઈએ.

pōtānī jaṁga ughāḍīē tē nāgā jaṇāīē.

Literally: Exposing one's own thigh reveals oneself to be naked.
What it means: Exposing one's private family faults to others brings dishonor upon oneself.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · 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.