mindmap root((摆动)) swing implies a movement through an arc of something attached at one end or one side: the door suddenly ~ open. sway implies a slow swinging or teetering movement: the bridge ~ed a little and then fell. oscillate stresses a usually rapid alternation between extremes of direction: a fan that ~s will cool more effectively. vibrate suggests the rapid oscillation of an elastic body under stress or impact: the ~ing strings of the piano. fluctuate suggests a constant irregular changing of level, intensity, or value: monetary exchange rates ~ constantly. waver stresses an irregular motion suggestive of reeling or tottering: his whole body ~ed as he crossed the finish line. undulate suggests a gentle wavelike motion: an ~ing sea of grass.