The Urdu lafz Khalish means anxiety, apprehension
Koi mere dil se pooche tere teer-e-neemkash ko
Ye khalish kahan se hoti, jo jigar ke paar hota
– Mirza Ghalib
Someone ask my heart how it feels about your half drawn arrow
This anxiety would not be there, if the arrow had been shot through my heart
Woh na aaye tou satati hai khalish see dil ko…
Woh jo aaye to khalish aur jawan hoti hain
– Sahir Hoshiyapuri
If she doesn’t come, this anxiety begins to trouble the heart
If she does come, the anxiety becomes even younger and stronger
urduwallahs 
thank you for the word which has hidden pain & pleasure in it….reminded me of the song ‘ Mere dil mein halki si woh khalish hai, jo nahi thi’ from 1963 movie “Parasmani”