• Stoplight

    Alternative forms

    Noun

    stoplight

    (plural stoplights)
    1. (US) A traffic control signal, traditionally consisting of three lights, colored green, yellow/amber, and red, meaning proceed, prepare to stop, and stop, respectively.

    Usage notes

    The two-word form stop light was initially more common, but its usage plateaued around 1950, whereas usage of stoplight increased continually since that year, overtaking stop light around 1970.

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