green light (n.)
- acceptance
- admission
- affirmation
- alarm
- allowance
- approbation
- approval
- authentication
- authorization
- balefire
- beacon
- bell
- blinker
- buoy
- certification
- charter
- confirmation
- consent
- countersignature
- dispensation
- endorsement
- flare
- foghorn
- glance
- go-ahead
- heliograph
- imprimatur
- kick
- leave
- leer
- liberty
- license
- nod
- nudge
- okay
- patent
- permission
- poke
- ratification
- release
- rocket
- sanction
- seal
- semaphore
- sign
- signal
- signature
- signet
- stamp
- subscription
- ticket
- touch
- validation
- visa
- vise
- waiver
- warrant
- wink