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Polish word koszmar comes from Old Dutch *mara, Proto-Germanic *mērijaz (Renowned, famous, great.)
*mara (Old Dutch)
*mērijaz (Proto-Germanic)
Renowned, famous, great.
mar (Middle Dutch)
cauquemare (Old French)
Nightmare.
cauchemare (Middle French)
Nightmare.
cauchemar (French)
Nightmare.
koszmar (Polish)
Nightmare.