brahmāra - of Lord Brahmā; eka - one; dine - in the day; tiṅho - He; eka-bāra - one time; avatīrṇa - descended; hañā - being; karena - performs; prakaṭa - manifest; vihāra - pastimes.

Once in a day of Brahmā, He descends to this world to manifest His transcendental pastimes.