Up to speed

Meaning

Fully informed or trained.

Usage

Used when conveying that someone now understands current knowledge.

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.

Racing metaphor for maintaining pace with others.

Used in engineering and training contexts since the 20th century.