SB 10.72.36

tataś caṭa-caṭā-śabdo
 vajra-niṣpesa-sannibhaḥ
gadayoḥ kṣiptayo rājan
 dantayor iva dantinoḥ
Synonyms: 
tataḥ — then; caṭa-caṭā-śabdaḥ — the clattering sound; vajra — of lightning; niṣpeṣa — the crash; sannibhaḥ — resembling; gadayoḥ — of their clubs; kṣiptayoḥ — being swung; rājan — O King (Parīkṣit); dantayoḥ — of the tusks; iva — as if; dantinoḥ — of elephants.
Translation: 
When Jarāsandha’s and Bhīmasena’s clubs loudly collided, O King, the sound was like the impact of the big tusks of two fighting elephants, or the crash of a thunderbolt in a flashing electrical storm.
Purport: 

This translation is based on Śrīla Prabhupāda’s Kṛṣṇa.