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to not know where one stands
to not know when/where to stop
to not know what nerves are
to not know the score
to not know the first thing about something
to not know the first thing
to not know someone from Adam
to not have a foot/leg to stand on
to not give a shit
to not half do something
to not be above something
to not be on speaking terms with someone
to not be much good
to not be in the same league as someone
to not be in the right frame of mind to do something
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