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out of one's depth

adverb

Roget 208: beyond one's depth, out of one's depth; over head and ears; mark twine, mark twain.   

adjective

Roget 704: difficult, not easy, hard, tough; troublesome, toilsome, irksome; operose, laborious, onerous, arduous, Herculean, formidable; sooner said than done; ... show more

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