Caught something with a net, or figuratively, achieved or earned something (especially money or profit).
From net (from Old English nætt, related to Germanic words, possibly from a root meaning 'to tie') + -ed (past tense). The fishing meaning is original; the financial meaning emerged later as an extension.
The term 'net profit' uses this meaning—what you 'net' is what remains after you've caught it and processed it, which is why the accounting term comes from fishing, making business language surprisingly poetic.
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