Shell out
Meaning
Pay money, usually reluctantly.
Usage
Used for describing unexpectedly high or grudging payments.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Shells were once used as payment; shelling out meant handing over valuables.
19th-century slang described paying coin or shell, a unit of barter.