લડાઈમાં ધા ને રમતમાં દાવ ચૂકવા નહીં.

laḍāīmāṁ dhā nē ramatamāṁ dāva cūkavā nahīṁ.

Literally: In battle do not miss a blow, and in a game do not miss a move.
What it means: Advises taking full advantage of every opening in a conflict or competition without delay.

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.