Upstairs,Downstairs,Headquarters

[yiuho]

Hi,

Can I use singular form of Upstairs, downstairs, headquarters, like upstair,downstair,headquarter? As I checked the Longman,Oxford Dictionary..all these words only have plural form, right?

Thanks for your help.

Yours,

William

[konungursvia]

Yes, don't use them without the final s.

[yiuho]

But I found some dictionaries show downstair, upstair, headquarter, can I say that dictionaries are incorrect?

[konungursvia]

Do you mean those cheap electronic dictionaries? Yes, they can be wrong. A print dictionary is unlikely to have them in the singular.

[yiuho]

Do you mean those cheap electronic dictionaries? Yes, they can be wrong. A print dictionary is unlikely to have them in the singular.

Yes, I found these mistakes in electronic dictionaries and some print dictionaries.