Ramban #1 (citing the Ibn Ezra): They meant that Moshe had dominated them in many different ways or that Aharon had dominated them as well.
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2.
Ramban #2: They meant 'Is the major evil that you did to us, to let us die in the desert not sufficient, that you now even
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want to dictate to us in this minor way, to make us appear before you - To be sure, your intention is to dominate and govern us!'
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Rashbam: Placing "Gam" at the beginning of the phrase,
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it reads "Ki Gam Sistarer aleinu Histarer".
It is possible however, that this was what Dasan and Aviram claimed, but that it was not true - just as they lied when they clsimed "Ki Sistarer aleinu Gam Histarer"..