Stock in trade

Meaning

Tools or skills one regularly uses.

Usage

Used when discussing professional habits or resources.

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.

Merchants literally kept stock for sale; metaphor expanded.

Elizabethan merchants coined the idea and it persisted in commerce.