Englishfor English speakers
testify
—
verb
give testimony in a court of law
—
verb
(= evidence, show)
provide evidence for
The blood test showed that he was the father
Her behavior testified to her incompetence
against
Preposition
—
In opposition, or not agreeing, to.
I am against that proposal. I think it is a bad idea.
—
Pressed to.
He held her head against his chest.