To separate or disconnect something from something else; to remove a part from a whole.
From French 'détacher,' derived from 'de-' (away) and 'tache' (a clasp or fastening). Originally meant to unfasten or undo what had been attached.
Detachment is so important that it's a military term—a 'detachment' is a small group of soldiers separated from the main unit—showing how 'detach' literally means to separate and send off on its own mission.
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