köken: Mackenzie asserts that it is inherited from Middle Persian ʾy (ay). However according to Dehkhoda it is from Arabic أَيْ (ʔay), which itself is borrowed from Middle Persian ʾy (ay).
If you tell him don't bother (more power to your elbow), he would say let me ride on your shoulder.
روز مرگُم باشه ای یی رو بفَمَم که اَزُم سیر شده وُ دوسُم نداره. Ruze margom baše ay yey ru befāmam ke azom sir šode o dusom nadâre. (Shiraz)