Study X “at depth”?

Is it grammatically correct to say that you wish to “study X at depth” (where X is some subject/field).

I thought you could say “study X at depth” similar to how you could say “study X in depth”, but I’m not so sure anymore


I think you might have (con)fused “in depth” and “at length” with one another.

The Cambridge Dictionary define in-depth as:

done carefully and in great detail

For example:

You might have studied American modernism in-depth.

The idiom at length is defined by The Free Dictionary as:

in great detail

For example:

I studied American modernism in college, so I can speak about it at length.

Source : Link , Question Author : Pozogo , Answer Author : 3kstc

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