To expel a person from a country, typically someone who is not a legal resident; or to conduct oneself in a specified manner.
From Latin deportare, combining de- (away, from) + portare (to carry), literally meaning 'to carry away.' The word entered English via Old French deporter in the 15th century, initially meaning to carry oneself or behave, then developing the legal sense of carrying someone away from a country by official order.
Notice how 'deport' and 'transport' are directional opposites from the same root! Transport carries you TO a destination, while deport carries you AWAY from where you are. Both involve the government moving people, but transport brings them in while deport sends them out — it's like the difference between import and export for people!
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