Dagha means to betray or mislead and daghabaaz is someone who betrays or deceives.

qateelHere is a couplet by Qateel Shifai with the lafz:

Woh mera dost hai saare jahan ko hai maloom
Dagah kare woh kisi se toh sharam aaye mujhe

He is my friend, the whole world knows so
When he betrays or deceives, I stand ashamed