A very interesting article by Abhay Avachat on this topic was published in RMIM usenet group in 1995. This article is a must read for all shayari fans:

Dost ghamkhwaari mein meri Sa'ii farmaveingay kyaa
Zakhm ke bharnay talak nakhun Na barh javeingay kyaa?

Ghamkhwaari: (literal)  Swallowing of grief.

Sa'ii: Effort (roughly)