Out of your depth means a task or conversation needs knowledge or experience you don't have. The image comes from swimming: you've gone where your feet no longer touch the bottom. People usually say it honestly about themselves: I'm out of my depth with this software. It works for both work and study.
When would you say out of your depth?
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be / feel out of my / your / their depth; out of your depth in / with something
- I felt out of my depth when the discussion moved to advanced physics.
- The new organiser was out of her depth with a festival that large.
- We admitted we were out of our depth and asked an experienced editor for help.
What changed
First versionI felt out of depth during the technical presentation.
RevisionI felt out of my depth during the technical presentation.
Phrases like out of breath, out of reach and out of time have nothing before the noun, so out of depth looks complete. But this idiom always needs a possessive before depth: my, your, her, their, showing whose depth it is. Adding my makes the expression work.
Nervous is about feelings: you can be nervous even when you're well prepared. Out of your depth means you really lack the knowledge or experience. A fish out of water is awkwardness in an unfamiliar setting, even when your skills are fine: an engineer at a fashion show.
Your turn
I understand the basics, but I am out of ___ depth in this advanced debate.
Show the answer
my — Depth needs a possessive word before it: out of my depth. The idiom isn't used with the.
Write about a situation where you didn't know enough and had to ask for help.
I was out of my depth with the sound equipment, so I asked the technician to show me the controls.
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