One of the mysteries of the English language finally explained.
1‘transport bosses gave the green light to major road safety improvements’
authorize, give permission for, permit, sanction, allow, agree to, approve, give one's assent to, give one's consent to, consent to, assent to, accede to, countenance
license, legalize, make legal, legitimize, legitimatize
ratify, endorse, validate, accredit, warrant
informal give the go-ahead for, give the OK to, OK, give the thumbs up to
North American informal green-light
North American rare approbate
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