Meaning
To reason and react quickly and effectively without any preparation - to improvise soundly while events press on, as in hostile questioning, negotiation, teaching, or live performance. It is always a compliment to mental agility under pressure. Approving and fairly informal to neutral; a stock phrase in job ads, interviews, and training contexts. Regional use: General English.
Origin
The expression extends 'on one's feet' in its sense of being up, alert, and in the thick of action rather than seated and deliberating at leisure; the American Heritage Idioms dictionary, which dates the idiom to the first half of the 1900s, glosses it through 'on one's feet' meaning wide awake and alert. Oxford's learner's dictionaries give the modern definition: to think and react to things very quickly and effectively without any preparation. No authoritative public source documents a specific first use or a particular originating scene; suggestions that it arose from boxing, debating, or courtroom practice are speculation rather than record. The honest account is a 20th-century coinage built on an old phrase, capturing decision-making performed standing in the flow of events.
Research Sources
References used to check this entry’s meaning, history, or documented forms.
Variants
- fast on your feet
- think on one's feet
- think quickly on your feet
- thinking on your feet
Usage Examples
- A good trial lawyer has to think on her feet when witnesses change their stories.
- The interview panel threw in odd questions to see whether candidates could think on their feet.
- Teaching a class of six-year-olds trains you to think on your feet.