eyewink

/ˈaɪˌwɪŋk/
noun
  1. A very brief moment; an instant.
    • The surprise party was over in an eyewink.
    • The car disappeared around the corner in an eyewink.
    • He finished his homework in an eyewink and went out to play.
  2. The act of closing and opening one eye quickly, often as a signal or gesture; a wink.
    • A single eyewink from the teacher meant we could start the test.
    • She gave him a quick eyewink to show she was joking.
    • His sly eyewink told me he had a secret plan.