get out of one's depth

verb

Roget 310: plunge, dip, souse, duck; dive, plump; take a plunge, take a header; make a plunge; bathe etc. (water) 337.    submerge, submerse; immerse; douse, sink, engulf, send to the bottom.    get out of one's depth; go to the bottom, go down like a stone, drop like a lead balloon; founder, welter, wallow.    ... show more

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