A woman gives the thumbs-up sign.
- Thumbs-up is a gesture showing an expression of approval.
When your boss gives you the go-ahead to continue working on a project, this is an example of a time when your boss gives you the thumbs-up to work on a project.
(plural thumbs up)
With reference to the signal of approval or disapproval used by spectators at a Roman amphitheatre, but sense has been reversed.