go out of one's depth

verb

Roget 863: be rash etc. adj.; stick at nothing, play a desperate game; run into danger etc. 665; play with fire, play with edge tools.    carry too much sail, sail too near the wind, ride at single anchor, go out of one's depth.    take a leap in the dark, buy a pig in a poke.    donner tete baissee [Fr.]; knock, one's bead against a wall etc. (be unskillful) 699; rush on destruction; kick against the pricks, tempt Providence, go on a forlorn hope, go on a fool's errand.    reckon one's chickens before they are reckon one's chickens before they are hatched, count one's chickens before they are hatched, reckon without one's host; catch at straws; trust to a broken reed, lean on a broken reed.    ... show more

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