To speak up is to talk louder, or to say bravely what you think. Speak up, we cannot hear, speak up for the others, afraid to speak up.
The volume sense is the literal one and the brave sense is the important one. Speaking up at work is now a formal idea, with policies written about it.
1phrasespeak upTo talk louder; also, to bravely say what you think.
“Nobody was willing to speak up at the meeting.”
speak up is a phrase.
Practised in Phrasal Verbs