Meaning 1 · most common
talk louder
to talk in a louder voice so people can hear you clearly.
Examples
Could you please speak up? I can't hear you at the back.
A: Sorry, I didn't catch that. Can you speak up?
B: Sure! I said the meeting is at 3 o'clock.
Common mistake
Not: Can you speak up your voice?
Say: Can you speak up?
'Speak up' already means talk louder — don't add 'your voice'.
More on “talk louder”Another example · Tell it apart · Goes with · Tip
Another example
During my presentation, my teacher asked me to speak up so everyone could understand me.
Tell it apart
Speak up, I can't hear you.
Speak up if you disagree.
Goes with
- speak up + context