noun
easy money; quick profit
Refers to money gained with little effort, often through speculation or a lucky break. Can carry a slightly negative nuance of unearned or speculative gain.
株で浮利を得ようとするのは危険だ。
Trying to make a quick profit in stocks is risky.
彼は浮利を追って失敗した。
He chased easy money and failed.
Compound of 浮 (ふ, 'floating; transient') and 利 (り, 'profit; interest'). The exact historical derivation is uncertain, but the kanji suggest profit that is not firmly grounded.