Entry 1 sense Webster, 1913 Quaggy · Quag·gy · IPA /ˈkwɒɡi/ 01 a. Of the nature of a quagmire; yielding or trembling under the foot, as soft, wet earth; spongy; boggy. 1. Of the nature of a quagmire; yielding or trembling under the foot, as soft, wet earth; spongy; boggy.