yes lightning can strike water and it can travel underwater and
kill fish.
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It can be (lightening hair, lightening loads, lightening skies).
It is the present participle of the verb to lighten, meaning to make lighter, either in color or weight. Lightening (not lightning) may be a verb, noun, or adjective.
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lightening symbolises loss of ignorance. In dreams lightening is
a symbol of a terrible event and negativity.