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Definition of Water wing
1. Noun. One of a pair of inflatable plastic bands, normally worn on the upper arms, to help a wearer float in water and learn to swim. ¹
2. Noun. (archaic architecture) One of two walls built on either side of the junction of a bridge with the bank of a river, to protect the abutment of the bridge and the bank from the action of the current. ¹
¹ Source: wiktionary.com