| 词汇 | billy |
| 词源 | billy. The American policeman’s billy, or nightstick, seems to have taken its name ultimately from a short crowbar once used by burglars for prying open doors and windows. The crowbar was named in about 1848 after the personal name Billy, though not after any specific person, and within 10 years it became the name of the club policemen wear at their sides. |
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