1. [informal] A signal to proceed
   "The diver gave a thumbs-up to indicate that everything was okay before descending";
   - green light, go-ahead
    
2. A gesture of approval or encouragement made by pointing the thumb upward; an expression or act of approval or agreement
   "The new policy got a thumbs-up from most employees"

1. An indication of satisfaction or approval
   "The director gave the actors a thumbs up after the successful rehearsal"

Derived forms: thumbs-ups

Type of: approval, commendation, robot [S.Africa], stoplight [N. Amer], traffic light, traffic signal

Encyclopedia: Thumbs-up