When Lord Vamanadeva was offered three steps of land, He expanded His three steps by covering the entire universe. In this way the three worlds trembled, & therefore Sri Vamanadeva is referred to as Urukrama

Expressions researched:
"When Lord Vāmanadeva was offered three steps of land, He expanded His three steps by covering the entire universe. In this way the three worlds trembled, and therefore Śrī Vāmanadeva, the incarnation of Lord Viṣṇu, is referred to as Urukrama"

Sri Caitanya-caritamrta

CC Madhya-lila

Uru means “very great,” and krama means “step.” When Lord Vāmanadeva was offered three steps of land, He expanded His three steps by covering the entire universe. In this way the three worlds trembled, and therefore Śrī Vāmanadeva, the incarnation of Lord Viṣṇu, is referred to as Urukrama.

CC Madhya 24.20, Translation and Purport

“‘Krama’ also means ‘power,’ ‘trembling,’ ‘a systematic method,’ ‘argument’ and ‘a forcible attack by stepping forward.’ Thus Vāmana caused the three worlds to tremble.

Uru means “very great,” and krama means “step.” When Lord Vāmanadeva was offered three steps of land, He expanded His three steps by covering the entire universe. In this way the three worlds trembled, and therefore Śrī Vāmanadeva, the incarnation of Lord Viṣṇu, is referred to as Urukrama.