Usage Note
Tromper means to deceive someone, and se tromper (reflexive) means 'to be mistaken' — a crucial distinction. Il m'a trompé means 'he deceived me', while je me suis trompé means 'I made a mistake'. In a romantic context, tromper son partenaire means 'to cheat on one's partner'.
Examples
"Il ne faut pas tromper ses amis."
Natural Translation
You should not deceive your friends.
Literal Translation
It is-not necessary not to-deceive one's friends

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