Could indeed be a bad starter. Are you certain that the terminals were
clean when you tried to jump it, and that you were getting good connections?
Not uncommon to find a shorted starter to be the cause of the engine turning
Another thing...never forget to check the internals where the battery + and
ground cables go into the battery.. These are well known for internal
that can play tricks on a person.
When you are sure that ALL the connection points are good without a doubt,
then move on to other suspects, like the starter, charging system, battery.
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