Bhagavad Gita 1.12 Chapter 1, Verse 12

तस्य संजनयन्हर्षं कुरुवृद्धः पितामहः ।
सिंहनादं विनद्योच्चैः शङ्खं दध्मौ प्रतापवान् ॥१.१२॥

tasya saṃjanayanharṣaṃ kuruvṛddhaḥ pitāmahaḥ
siṃhanādaṃ vinadyoccaiḥ śaṅkhaṃ dadhmau pratāpavān

Meaning

Then Bhishma, the glorious grandsire and eldest of the Kurus, roared like a lion and blew his conch loudly to cheer Duryodhana.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 1.12 (Chapter 1, Arjuna's Despair (Arjuna Vishada Yoga), Verse 12)