1. 不履行;未支付
    If a person, company, or country defaults on something that they have legally agreed to do, such as paying some money or doing a piece of work before a particular time, they fail to do it.

    e.g. The credit card business is down, and more borrowers are defaulting on loans...
           信用卡业务出现了下滑，而且越来越多的借款者都不按期还款。
    e.g. The first warning signals came in March when the company defaulted on its initial payment of £30 million.
           第一次出现警示信号是在3月份，当时该公司未能按时交纳3,000万英镑的首期付款。

2. 默认的
    A default situation is what exists or happens unless someone or something changes it.

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    e.g. ...default passwords installed on commercial machines...
           商用机器上设置的默认口令
    e.g. Death, not life, is the default state of cells.
           细胞的常态是死亡而不是存活。

3. 默认值;缺省指令
    In computing, the default is a particular set of instructions which the computer always uses unless the person using the computer gives other instructions.

    e.g. The default is usually the setting that most users would probably choose.
           默认选项通常是大多数用户都会选择的设置。
    e.g. ...default settings.
           默认设置

4. (事情的发生)自动地(因可能阻止或改变结果之事未发生)
    If something happens by default, it happens only because something else which might have prevented it or changed it has not happened.

    e.g. Spassky won the first game, and was awarded by the second by default, when Fischer failed to put in an appearance...
           斯帕斯基赢了第一局，又因菲舍尔第二局未能上场而再胜一局。
    e.g. I would rather pay the individuals than let the money go to the State by default.
           我宁愿把这些钱付给个人，也不愿它们因未作任何处置而自动地归国家所有。

5. 因…未发生;因…不可能
    If something happens in default of something else, it happens because that other thing does not happen or proves to be impossible.

    e.g. Malvolio becomes, in default of competition, the play's moral centre.
           因为没有与其竞争者，马伏里奥自然成了该剧的道德核心。