tickle the dragon's tail

/T IH1 K AH0 L DH AH0 D R AE0 G AH0 N EH0 S T EY0 L/
verb
  1. 1

    (idiomatic) To do something that has a risk of going catastrophically wrong.

  2. 2

    (idiomatic) To annoy an irritable person.

  3. 3

    (nuclear physics) To bring two subcritical masses close together in order to find the edge of criticality.