The King (Prataparudra) would understand that the Lord (Caitanya) was showing mercy to him (if Caitanya would send a piece of His clothing to the King). The King would then not do anything drastic like giving up his life or becoming a mendicant

Expressions researched:
"the King would understand that the Lord was showing mercy to him. The King would then not do anything drastic like giving up his life or becoming a mendicant"

Sri Caitanya-caritamrta

CC Madhya-lila

The King was very anxious to see the Lord, yet it was not possible for the Lord to see him. Just to resolve the situation, Nityānanda Prabhu suggested that the Lord send an old piece of clothing. Thus the King would understand that the Lord was showing mercy to him. The King would then not do anything drastic like giving up his life or becoming a mendicant.

CC Madhya 12.34, Translation and Purport

“If You, out of Your mercy, send one of Your outer garments to the King, the King would live hoping to see You some time in the future.”

Śrī Nityānanda Prabhu was thus very tactfully suggesting that Caitanya Mahāprabhu give a piece of His old clothing to the King. Even though the King was not to meet the Lord, the King would then be pacified by receiving such a cloth. The King was very anxious to see the Lord, yet it was not possible for the Lord to see him. Just to resolve the situation, Nityānanda Prabhu suggested that the Lord send an old piece of clothing. Thus the King would understand that the Lord was showing mercy to him. The King would then not do anything drastic like giving up his life or becoming a mendicant.