To speak up for someone or something is to show your support by publicly expressing your opinions.
Examples of use:
1. Elise spoke up to defend Alice when she was accused of theft.
2. Minority ethinic groups should be empowered to speak up for themselves.
To speak up is also to speak more loudly so that you can be heard.
Examples of use:
1. Speak up. I can’t hear you.
2. You’ll have to speak up. He’s a bit deaf.
3. Can you speak up, please? We can’t hear you at the back of the room.
infinitive – speak up
present simple – speak up and speaks up
-ing form – speaking up
past simple – spoke up
past participle – spoken up
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