WordWeb Online

1. Become quiet or calm, especially after a state of agitation
   "After the fight both men need to wind down.";
   - calm, calm down, cool off, chill out [informal], simmer down, settle down, cool it [informal], take a chill pill [informal]
    
2. Lower a window to open it, e.g. in a car
    
3. Slow; become calmer or less busy

Derived forms: winds down

Type of: change state, turn