D. B.

US 
UK 
abbr.
1.
(=double bottom)双层底;daybook 日记账;〈美〉= disciplinary barracks 军人监狱;〈美口〉drop-by 礼节性顺访;社交性亮相

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard