What もう means in this sentence?


> もう少し大きな声で話してください (Please speak slightly louder.)

What もう means/stands for in this sentence?




This もう is an adverb that means something along the lines of "more" or
"additionally". In your case, you can think this もう corresponds to '-er':

  * 少し大きな声で  
in a bit loud voice

  * **もう** 少し大きな声で  
in a bit loud **er** voice

The latter can be used even when the listener is already trying to speak in a
loud voice. You can remember もう少し and もうちょっと as set expressions that mean "a
little **more** ～".

Another example:

  * 5分待つ  
to wait for five minutes

  * **もう** 5分待つ  
to wait for **another** five minutes

