Meaning
Ill-gotten gains: Money or any acquisitions obtained by dishonest, illegal, or evil means.
Sentence Examples
“He seemed a typical rich businessman, but all his wealth was ill-gotten gains.”
“After stealing the jewelry, he needed a place to hide his ill-gotten gains until things cooled down.”
“I won big money at cards but the fact is I cheated. I felt uncomfortable keeping my ill-gotten gains so I gave it all to charity.”

Origin
This idiom used ill in the sense of badly or wrongly and has been used since at least the early part of the 1800’s.
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