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"Chen" is a diminutive ending. If "-chen" is added to a word the word becomes neuter and the vowel very often takes an umlaut. (der Bruder) das Brüderchen - little brother (Vogel) Vögelchen - little bird (Haus) Häuschen - hut, cabin (Brot) Brötchen - bread roll Another similar diminutive ending is "-lein" (der Bruder - das Brüderlein).


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Generally speaking its a diminutive that when added to a word (i.e Brötchen) it means a little version of itself.


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