Whenever someone took your name in front of me, I had to hold back and console my suffering, tormented heart.

Mir captures that involuntary, visceral ache when an old beloved's name is casually brought up in conversation. The heart is already bruised and exhausted from longing, so merely hearing that name threatens to make it burst right out of the chest. By repeating 'held fast' (thaam thaam liya), he turns an emotional shock into a physical struggle to simply hold himself together and conceal his pain.