Verse meaning
This is the verse translation, not a definition of the individual word.
Those who consume usury will not stand [on the Day of Resurrection] except like those driven to madness by Satan’s touch. That is because they say, “Trade is just like usury[1].” But Allah has permitted trade and forbidden usury. Whoever desists because of receiving admonition from his Lord may keep his past gains, and his case is left to Allah. But whoever returns to it, they are the people of the Fire; they will abide therein forever.
Source
[1] The image here is of a person possessed by the devil, staggering and unable to stand or walk steadily when resurrected on the Day of Judgment. It is a just requital, for it mirrors their insatiable lust for money in this life and their twisting of the laws ordained by Allah, declaring lawful what He has forbidden.
Source: QuranEnc.com · English Translation - Rowwad Translation Center
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