eka-dina mahāprabhu samudre yāite'caṭaka'-parvata dekhilena ācambite
eka-dina - one day;mahāprabhu - Śrī Caitanya Mahāprabhu;samudre yāite - while going to the sea;caṭaka-parvata - the Caṭaka-parvata sand dune;dekhilena - saw;ācambite - suddenly.