swing: implies a regular or uniform movement usually to and fro: ~ the rope back and forth.  (swing还表示秋千; swing state摇摆州; 词组to go with a swing形容a party or an activity聚会或活动热闹有趣气氛热烈to be lively and enjoyable或者形容music音乐有强劲的节奏to have a strong rhythm，如Sara Lewis' impressive performances are guaranteed to make the party go with a swing萨拉·刘易斯令人赞不绝口的表演一定能使聚会的气氛活跃热烈,词组be in full swing表示活动在热烈进行中，处于兴盛高潮阶段having reached a very lively level, being no longer in its early stages，如when we arrived the party was already in full swing我们赶到时，聚会已进入高潮)


wave: usually implies a smooth or continuous motion: a flag ~ing in the breeze.  


flourish: suggests a vigorous, ostentatious, or graceful movement of something held in the hand: ~ing her racket, she challenged me to a match.  （graceful优雅优美指"动作"控制得好implies movement in a smooth and controlled way, 如his movements were so graceful they seemed effortless他的动作优美，看起来毫不费劲，这个词还表示有礼貌和善即有风度、得体to be polite and kind，如his father had always taught him to be graceful in defeat他父亲总是教导他输了也要有风度，如I think we should just give in gracefully我认为应该大大方方地认输）


brandish: implies a threatening or menacing motion: ~ing his fist, he vowed vengeance.  menace是有敌意让人警惕的threat: hostile and alarming threat，如a menace to peace威胁和平。    又如part of the stick Mr Obama intends to brandish奥巴马想要挥舞的大棒的一部分，和stick对应的是dangled carrot吊着的胡萝卜


thrash: suggests a vigorous, abrupt, violent movement: a boy ~ing about in a tantrum.（movement和motion都可以做可数名词，表示移动动作implies a change in position，这5个词中的amotion和a movement意思相同交替使用，但motion还表示移动的"状态"state of something moving，这时做不可数名词，如"inertia is the name for the tendency of an object inmotion to remain in motion, or an object at rest to remain at rest unless acted upon bya force"---惯性是指除非有外力作用，运动的物体倾向于运动，静止的物体倾向于静止，如photographs of people in motion行走人群的照片。一般不说in movement）


swing摇动摆动: 指规律一致的动作，常表示来回往复，wave挥手飘扬: 表示平滑连贯的动作，flourish挥舞: 表示用力挥舞手中的东西，优美惹眼，brandish挥动挥舞: 表示威胁的动作，thrash胡乱挥舞、重击鞭打: 表示突然猛烈的动作


记忆方法: 1）首字母摇摆SWFBT想成SWIFT快速，想成I我变Boy男孩<==快速摇摆

         2）摇摆的意思是使上下来回移动mean to wield or cause to move to and fro or up and down.