Noun:

1. withdrawing support or help despite allegiance or responsibility;

   "his abandonment of his wife and children left them penniless"
   

2. the state of having rejected your religious beliefs or your political party or a cause (often in favor of opposing beliefs or causes)

apostasyn.背教；脱党；变节

renunciationn.放弃；自制

desertionn.开小差；遗弃；潜逃

betrayaln.背叛；暴露

unfaithfulnessn.不忠

treasonn.叛逆 通敌 背叛 叛国罪

recreancyn.胆小；怯懦；不义

faithlessnessn.无信不贞.

perfidyn.不诚实；不忠；背信弃义

disloyaltyn.不忠实

recreancen.懦弱；怯懦

failuren.失败；失败者；不及格；疏忽；失灵；未能；悲惨的事

lackn.缺乏；无v.缺乏；不足

forsakingv.放弃；断念；抛弃

deficiencyn.缺乏；不足；缺陷；缺点

lossn.遗失；丧失；损失；失败；失落；死亡

rejectingvt.拒绝；排斥；驳回；丢弃n.不合格产品；被拒之人

forswearingn.发誓放弃；断然丢弃动词forswear的现在分词形式.=foreswearing.

renouncementn.放弃；拒绝；否认

rejectionn.拒绝；被弃；[医]排异

secessionn.脱离；分离Secession：(美国南部十一州在南北战争开始时)脱离联邦.

withdrawaln.撤退；退回；取消

conversionn.转变；换算

reversaln.翻转；倒转；反转

backslidingvi.堕落；退步；背离宗教

changeovern.转换；逆转；大变更

turnaboutn.旋转；转变

switchovern.替换；转换

outadv.出；在外；完prep.向外；在外面v.出来；暴露；驱逐；熄灭；伸出；公开…的同性恋身份

droppingn.点滴；滴下；落下物(复)droppings: 动物的粪.动词drop的现在分词形式.

coppingn.纺锤状线团、管纱；警察vt.抓住、发现（某人）在干坏事；获得（某事物）、遭受；握住（某物）

awayadv.离开；远离；在远处；一直；朝另一个方向；消失adj.不在的；遥远的；[棒]出局的；客场的

fallingn.坠落；下降adj.落下的；下降的动词fall的现在分词.

abandonmentn.放弃；自暴自弃；放纵

1. His defection to the other side was the ultimate betrayal.
   他变节投向另一方是最终的背叛。
2. In the game, cooperation and defection result in differing payoffs depending on what the other participants do.
   在游戏中，合作和背叛所得到的后果将根据其他参与者的作为而定。
3. The defection of a large number of back-benchers brought down the last government.
   大量的不居要职的普通议员脱党，造成前任政府的垮台。