Sway/sweɪ/ Definition 1 of 4Pro Tip 1/2Physical movement Use 'sway' to describe objects or people moving rhythmically side to side. The dancer's hips swayed to the beat. Pro Tip 2/2Steady motion 'Sway' indicates a movement that's often gentle and steady rather than abrupt and fast. The hammock swayed gently in the breeze.