Nukta Cheen – means to be critical, criticism of something or someone

Here’s a wonderful sher by Qateel Shifai, with this Urdu lafz

Wohi toh sab se zyada hain nukta cheen mera
Jo muskura ke hamesha gale lagaye mujhey

The one who is most critical of me, it is him who smiles and gives me a hug every time we meet