out of one's depth(redirected from beyond one's depth)
out of (one's) depth
In a field or situation that exceeds one's knowledge or ability. Of course she's out of her depth with 25 employees reporting to her—she had hardly any supervisory experience before you gave her the job! I asked Alex to consult on this project because it's a bit out of my depth.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
out of one's depth
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.