spanner (English)
Where does "spanner" come from?
The word 'spanner' originates from the verb 'span,' which traces back to the Proto-Indo-European root *(s)pend-, meaning 'to stretch.' This root evolved into the Old English 'spann,' referring to the measurement of a hand's width, before eventually entering Middle English. By adding the agent suffix '-er,' the term evolved to describe a tool used to 'span' or tighten bolts, eventually expanding into the figurative phrase 'spanner in the works.'
Full etymology tree
- spanner (English), 'A hand tool for adjusting nuts and bolts.'
- derived span (English), 'The full width of an open hand from the end of the thumb to the end of the little finger used as an informal unit of length.'
- inherited spanne (Middle English), 'A span (unit of measure).'
- inherited spann (Old English), 'span (of a hand; used as a measurement, typically considered about nine inches)'
- inherited *spannu (Proto-West Germanic)
- inherited *spannō (Proto-Germanic)
- inherited *(s)pend- (Proto-Indo-European), 'to stretch'
- inherited *spannō (Proto-Germanic)
- inherited *spannu (Proto-West Germanic)
- inherited spann (Old English), 'span (of a hand; used as a measurement, typically considered about nine inches)'
- inherited spanne (Middle English), 'A span (unit of measure).'
- suffix -er (English), 'A person or thing that does an action indicated by the root verb; used to form an agent noun.'
- derived span (English), 'The full width of an open hand from the end of the thumb to the end of the little finger used as an informal unit of length.'
Direct ancestors
Updated July 2026
Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris