spanner

Short definition from Wiktionary

Noun

1. 1
   A hand tool for adjusting nuts and bolts.
2. 2
   A hand tool for adjusting nuts and bolts: Any of certain types of such a tool that have a pin or hook to engage the driven object.
3. 3
   One who, or that which, spans.
4. 4
   A (usually sparse) graph whose shortest path distances approximate those in a dense graph or other metric space.
5. 5
   A hand tool shaped like a small crank handle, for winding the spring of a wheel lock on a musket.
6. 6
   A device in early steam engines for moving the valves for the alternate admission and shutting off of the steam.
7. 7
   A problem, dilemma or obstacle; something unexpected or troublesome (in the phrase spanner in the works)
8. 8
   A stupid or unintelligent person; one prone to making mistakes, especially in language.

Verb

1. 1
   To use a spanner; to fix with a spanner