master of one

Definitions

A person who has achieved a high level of proficiency or expertise in a single specific field or skill.

The second half of the idiom 'jack of all trades, master of one,' emphasizing deep specialization over broad, superficial knowledge.

Examples

While he dabbled in many hobbies, he truly became a master of one by dedicating years to classical piano.

The company prefers to hire specialists who are a master of one trade rather than generalists who know a little about everything.

Synonyms

specialist expert in a single field niche professional focused authority singularly skilled individual

Antonyms

jack of all trades generalist polymath dilettante versatile amateur