out of ones depth

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Definition of out of ones depth in English English dictionary

out of one's depth
To be in a situation which one is poorly prepared or unprepared to handle

The team's first game was against the league champions; they were out of their depth and knew it.

out of one's depth
To be in water so deep that one cannot stand up and a may be at risk of drowning. http: //www.yourdictionary.com/idioms/out-of-one-s-depth