■ noun
1》 a building with sails or vanes that turn in the wind and generate power to grind corn into flour.
↘a similar structure used to generate electricity or draw water.
2》 Brit. a toy consisting of a stick with curved vanes attached that turn in the wind.
3》 a propeller, especially one on an autogiro.
■ verb
1》 move (one's arms) in a manner suggestive of the sails of a ~.
2》 (of a propeller, rotor, or aircraft) spin unpowered.
Phrases
fling (or throw ) one's cap over the ~(s) dated act recklessly or unconventionally.