speak for something—
1. (also: speak up for something ) speak in support of an idea, proposal, etc.:
- Mary always spoke for the rights of her people at a time when the civil rights movement was gaining ground.
2. (of things or actions) give proof in favor of smth.; be evidence of smth. (also: speak of something):
- His glittering array of awards speaks for his quality as a footballer.
speak volumes for something—(of things or actions)
1. give much significant information about smth.:
- This book speaks volumes for what the families endure when the situation takes a tragic turn.
2. provide abundant evidence of smth.:
- The way he has fought back from crippling knee injuries speaks volumes for his courage and determination.