〜そばから
no sooner … than (again and again)
Verb dictionary / た-form + そばから
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そばから says that as soon as something is done, it's undone, over and over: 片付けるそばから、子どもが散らかす, "no sooner do I tidy up than the kids make a mess again".
Unlike が早いか and や否や, which describe a single event, そばから describes a frustrating repeated cycle. The tone is usually exasperated.
The first half is an effort (tidying, memorising, earning, warning someone), and the second half cancels it (messing up, forgetting, spending, doing it again).
It comes from そば, "right beside", so it's "right beside the action, it's undone". Compare たびに (N3), "every time", which is neutral and doesn't imply undoing.
Examples
片付けるそばから、子どもが散らかす。
No sooner do I tidy up than the kids make a mess again.
覚えるそばから忘れてしまう。
I forget things as fast as I learn them.
注意したそばから、また同じミスをする。
The moment I warn him, he makes the same mistake again.
雪は降るそばから溶けていった。
The snow melted as soon as it fell.
彼は稼ぐそばから使ってしまう。
He spends money as fast as he earns it.