'sway' - Complete English Word Reference Definitions of 'sway' 1. When people or things sway, they lean or swing slowly from one side to the other. [...] 2. If you are swayed by someone or something, you are influenced by them. sway meaning, definition, what is sway: to move slowly from one side to another...: Learn more. Sway definition: to move or swing to and fro, as something fixed at one end or resting on a support.. See examples of SWAY used in a sentence. SWAY definition: 1. to move slowly from one side to the other: 2. to persuade someone to change their opinion or…. Learn more.