tasya - his; abhipaśyataḥ - while thus observing; kha-sthaḥ - situated in the sky; kṣaṇena - suddenly; kila - verily; bhārata - O descendant of Bharata; gaja-mātraḥ - just like an elephant; pravavṛdhe - thoroughly expanded; tat - that; adbhutam - extraordinary; abhūt - transformed; mahat - into a gigantic body.

O descendant of Bharata, while Brahmā was observing Him, that boar became situated in the sky in a wonderful manifestation as gigantic as a great elephant.