His business son often dines out and keeps disreputable company.

　　● come of age（成年）come of college age, 如：

　　Even his youngest son has now come of college age.

　　⒋惯用语组成部分的缩略，例如：

　　● every cloud has a silver lining（一线希望）silver lining

　　● make a mountain out of molehills（小题大作）mountains of molehills

　　有些惯用语缩略后引起转化词，如：

　　● call someone names（谩骂某人 ）name-calling：You wont command respect if you enjoy name-calling.

　　● Bury ones head in the sand（对面临的危险闭目不见） head-in-sand：Dont be so foolish as to adopt a head-in-sand attitude.

　　● live and let live （自己活，也让别人活）a live-and-let-live policy：All the countries in the world should adopt a live-and-let-live policy.

　　● A dog in the manger（占着茅坑不拉屎的人）a dog-in-the-manger attitude: As it is wrong to have a dog-in-the-manager attitude, you had better give what you dont want to others instead of holding on to it.

　　上述例子说明了严谨的惯用语，在特殊情况下，也可以稍微改变，或替换字眼，或拆开组成部分，或扩充词语，或缩略成分，达到灵活运用的目的。

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