词典释义：
failure to fulfil an obligation, especially to repay a loan or appear in a law court
不履行，违约，拖欠；未到庭
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it will have to restructure its debts to avoid default .必须重新整合债务才能避免拖欠。
a pre-selected option adopted by a computer program or other mechanism when no alternative is specified by the user or programmer
默认值。
fail to fulfil an obligation, especially to repay a loan or to appear in a law court
不履行，拖欠；未到庭
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some had defaulted on student loans .有些人拖欠了学生贷款。
[with obj.]declare (a party) in default and give judgement against that party
因未到场而取消…参赛资格
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two semi-finalists were defaulted, then reinstated .两名半决赛选手因未到场被取消参赛资格后重新获得资格。
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（计算机程序或其他机制）自动转到（默认值）
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when you start a fresh letter the system will default to its own style .你要重新写封信的时候，系统会自动转到默认格式。
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by default because of a lack of opposition 由于缺少对手 -
through lack of positive action rather than conscious choice 不经意地
he became an actor by default ． 他因为偶然的机会成为演员 -
go by default be decided in favour of one party because of lack of opposition by the other party 因一方未提出反对而判另一方获胜the case against us has gone by default ． 由于诉方未提出反对，我们赢了这场官司 -
in default guilty of failing to repay a loan or appear in a law court 拖欠违约，不出庭罪the company is already in default on its loans ． 该公司因其拖欠贷款已经违约 -
in default of in the absence of 因缺少，在缺乏…时in default of agreement the rent was to be determined by a surveyor ． 由于没有协议，租金将由房产稽查员决定
"Middle English： from Old French
