bargain

agreement, contract, treaty, convention, bargain, understanding, accord

这些名词均含“协定，协议，契约，合同”之意。
agreement: 普通用词，含义最确定，泛指个人、团体或国家之间取得一致而达成的任何协议、协定或合同、契约等，可以是口头的，也可以是书面的。
contract: 侧重指双方或多方订立的具有法律效力的正式的书面合同或契约。
treaty: 指国家之间经外交谈判后依照国际法签订的正式条约。
convention: 比treaty更专门化，但不及treaty正式。也可指国家之间就有关事情签订的条约。
bargain: 通常指商业交往中的购销合同。
understanding: 指不具约束力的非正式的协议。
accord: 多指国际间的非正式协议。

business, commerce, trade, bargain, deal

这些名词均含“贸易，交易”之意。
business: 指包括售货、购货、换货在内的综合商业活动，方式可以是批发或零售。
commerce: 多指大规模的买卖或易货关系。
trade: 普通用词，含义广。既可指某种具体的商业又可指广泛的贸易。
bargain: 多指买卖双方通过谈判、协商就商品质量、数量、价格等项达成协议所成的生意。
deal: 口语用词，指买卖双方经过交涉达成协议成交。

名词 bargain:

1. an agreement between parties (usually arrived at after discussion) fixing obligations of each
   同义词：deal
2. an advantageous purchase
   同义词：buy, steal

动词 bargain:

1. negotiate the terms of an exchange
   同义词：dicker
2. come to terms; arrive at an agreement

1. The exam was more difficult than I had bargained for.
   这次考试之难出乎我的意料之外。
2. The leaders bargained away the freedom of their people.
   领导人拿人民的自由来做交易。
3. If you promote our goods, we will give you a good discount as our part of the bargain.
   若你方经销我们的货物，我方愿给予你相当大的优惠作为回报。
4. She was a distinguished scientist and a gifted painter into the bargain.
   她是一位杰出的科学家－－同时还是一位很有才华的画家呢。
5. The salesman refused to bargain over the price.
   推销员拒绝讨价还价。
6. He bargained with them for the property.
   他就财产与他们进行商议。
7. He made a satisfactory bargain with them.
   他和他们做了一笔满意的交易。

bar.gain

n.（名词）
An agreement between parties fixing obligations that each promises to carry out.
协定：党派间确定责任的协定，任何一方都许诺履行

An agreement establishing the terms of a sale or exchange of goods or services:
买卖合约：规定了出售或交换商品或服务之条件的合约：
例句：
finally reached a bargain with the antique dealer over the lamp.
最后和这古董商签订了关于这个灯的买卖合约

Property acquired or services rendered as a result of such an agreement.
兑现合约：因这样的合约而获得的财产或服务
Something offered or acquired at a price advantageous to the buyer.
廉价货：以对买者有利的价格出售货物
v.（动词）
bar.gained,bar.gain.ing,bar.gains
v.intr.（不及物动词）
To negotiate the terms of an agreement, as to sell or exchange.
谈判：商谈关于售卖和交换等合同的条款
To engage in collective bargaining.
进行集中谈判
To arrive at an agreement.
达成协议
v.tr.（及物动词）
To exchange; trade:
交换；做生意：
例句：
bargained my watch for a meal.
用我的表换了一顿饭

<常用词组>bargain for 或
bargain on
To count on; expect:
指望；期待：
例句：
.I never bargained for this tearing feeling inside me.(Anne Tyler)
.我从来没想到自己内心有如此激烈的感情.(安妮·泰勒)

<习惯用语>into the bargain 或
in the bargain
Over and above what is expected; in addition.
出乎意料：超出、超过了期望值；另外
来源：
Middle English
中古英语
from Old French bargaigne [haggling]
源自 古法语 bargaigne [争论不休的]
from bargaignier [to haggle]
源自 bargaignier [争论不休]
[of Germanic origin] * see bhergh-
[源自日耳曼语] *参见 bhergh-

【引伸】
bar.gainer
n.（名词）
<参考词汇><同义词>bargain,compact,contract,covenant,dealThe central meaning shared by these nouns is .an agreement arrived at after discussion in which the parties involved promise to honor their respective obligations.:
这些名词的中心意思都是.党派间讨论之后而达成的许诺履行各自义务的协定.：
例句：
kept his end of the bargain and mowed the lawn;
承担着合同中的一项任务--割草；

例句：
made a compact to correspond regularly;
定期拟制契约使一致；

例句：
a legally binding contract to install new windows in the house;
规定房间里要安装新窗户的有法律约束力的契约；

例句：
a covenant for mutual defense;
互相保卫的盟约；

例句：
annoyance that wasn`t part of the deal.
契约之外的干扰