One of the definitions of 'lighten': to flash as or like lightning (often used impersonally with it as subject): It thundered and lightened for hours. So, 'It's lightening outside' is fine. I think that most of us just say 'Oh, look!
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Mister MicawberOne of the definitions of 'lighten': to flash as or like lightning (often used impersonally with it as subject)Well, I learned something today. I have never heard this use of "lighten". You're right though -- there it is in the dictionary. Is this something you ever use yourself, or have heard others use?
Is this something you ever use yourself, or have heard others use?
Just in the phrase as above ('It's lightening outside'), but I've never stopped to analyze that part of speech before, Mr W.