In the house of Kasi Misra, Sri Caitanya Mahaprabhu would sometimes be greatly aggrieved, feeling separation from Krsna. The joints of His transcendental body would slacken, and His arms and legs would become elongated

Expressions researched:
"In the house of Kāśī Miśra, Śrī Caitanya Mahāprabhu would sometimes be greatly aggrieved, feeling separation from Kṛṣṇa. The joints of His transcendental body would slacken, and His arms and legs would become elongated"

Sri Caitanya-caritamrta

CC Antya-lila

In the house of Kāśī Miśra, Śrī Caitanya Mahāprabhu would sometimes be greatly aggrieved, feeling separation from Kṛṣṇa. The joints of His transcendental body would slacken, and His arms and legs would become elongated. Rolling on the ground, the Lord would cry out in distress in a faltering voice and weep very sorrowfully. The appearance of Śrī Caitanya Mahāprabhu, awakening in my heart, maddens me.

CC Antya 14.73, Translation and Purport

In the house of Kāśī Miśra, Śrī Caitanya Mahāprabhu would sometimes be greatly aggrieved, feeling separation from Kṛṣṇa. The joints of His transcendental body would slacken, and His arms and legs would become elongated. Rolling on the ground, the Lord would cry out in distress in a faltering voice and weep very sorrowfully. The appearance of Śrī Caitanya Mahāprabhu, awakening in my heart, maddens me.

This verse is Gaurāṅga-stava-kalpavṛkṣa 4.