If you say that you thought/expected/said as much, it means that something bad that you thought/expected/said would happen has happened.

I knew he'd fail - I said as much at the time. 我知道他会失败——我早就说过了。

the same

Go on, lend me the money - you know I'd do as much for you. 快点，借钱给我吧——你知道我也会同样借钱给你的。