Strong's Hebrew: 4784. marah (maw-raw')
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4784. marah (maw-raw')
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A primitive root; to be (causatively, make) bitter (or unpleasant); (figuratively) to rebel (or resist; causatively, to provoke) -- bitter, change, be disobedient, disobey, grievously, provocation, provoke(-ing), (be) rebel (against, -lious).
Strong's Numbers Online Bible Dictionary