out of one's depth

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Also, beyond one's depth. Outside one's understanding or competence, as in He was out of his depth in that advanced calculus class, or The conductor realized that playing the fugue at the right tempo was beyond their depth. This expression alludes to being in water so deep that one might sink. [c. 1600] Also see over one's head.

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Words nearby out of one's depth

out of kilter, out of line, out of luck, out of nowhere, out of one's, out of one's depth, out of one's element, out of one's hair, out of one's mind, out of one's shell, out of one's system

How to use out of one's depth in a sentence

Really, is it any wonder that fluoride should freak people out?
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
For a while yoga and pilates classes were sought out at luxury gyms like Equinox.
How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze|Lizzie Crocker|January 9, 2015|DAILY BEAST
On Thursday, Garcetti ruled himself out of the race to succeed Boxer.
The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST

In his view, a writer has only one duty: to be present in his books.
Houellebecq’s Incendiary Novel Imagines France With a Muslim President|Pierre Assouline|January 9, 2015|DAILY BEAST
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.
Expressive Voice Culture|Jessie Eldridge Southwick
He alludes to it as one of their evil customs and used by them to produce insensibility.
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce|E. R. Billings.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.
Ramona|Helen Hunt Jackson
And he was gone, and out of sight on the swift galloping Benito, before Father Gaspara bethought himself.
Ramona|Helen Hunt Jackson
Most of the men leaped up, caught hold of spears or knives, and rushed out.
The Giant of the North|R.M. Ballantyne