CC Madhya 16.61

tāṅra mukha dekhi’ hāse śacīra nandana
aṅgīkāra jāni’ ācārya karena nartana
Word for word: 
tāṅra mukha — His face; dekhi’ — seeing; hāse — smiles; śacīra nandana — Lord Śrī Caitanya Mahāprabhu; aṅgīkāra jāni’ — understanding the acceptance; ācārya — Advaita Ācārya; karena — performed; nartana — dancing.
Translation: 
Seeing the face of Advaita Ācārya, Lord Śrī Caitanya Mahāprabhu smiled. Understanding that the Lord had accepted the proposal, Advaita Ācārya started to dance.