green-lit

The term is a back-formation from the noun phrase "green light," which originated from the universal traffic signal system where a green light indicates permission to go. The metaphorical use, meaning official approval, emerged in the early-to-mid 20th century, particularly in business and creative industries. The verb "to green-light" was formed by treating this compound adjective as a phrasal verb, following the pattern of converting descriptive states into actions (e.g., "to highlight"). Its evolution exemplifies how a concrete, visual signal from transportation infrastructure became a standard idiom for managerial or executive authorization in abstract planning processes.

Structure: green (color) + lit (light) - green: From Old English 'grēne', related to grass and growing things. In this compound, it functions as a metaphorical adjective derived from the "green light" traffic signal. - lit: Past tense and past participle of the verb 'light', from Old English 'līhtan', meaning to illuminate or set burning. Here, it signifies the state of having been given the signal.