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J'ai une chose à te dire.
I have something to tell you.
A concrete or abstract thing; the generic noun for an object, matter, or affair.
J'ai une chose à te dire.
I have something to tell you.
Feminine noun: la chose, une chose.
In the plural, means belongings or affairs.
Pose tes choses dans l'entrée.
Put your things in the hallway.
From Latin causa (cause, reason, affair).
Truc is the casual equivalent; chose is neutral and always safe.