It's wrong, but it is quite a good mistake I thought!

I have just caught up with this, and I have had a good laugh, thank you Anna and nina, that will teach me not to make fun of a very dear friend. (I almost typed Fiend, there!).

I loved the ' while and wipe' one. I wanted to write something about Cynthia Payne.

Oh and ' tow the line' not toe and ' state of the ark'

DH was convinced it was "one fowl swoop" and not "fell swoop". He had used the former all his life without realising it was incorrect.

I am very bad at seeing these and my typing is not accurate. I tend to read and hear the words and recognise the sound rather than the pattern of letters.
Proof reading anything I have written is really difficult.

Muphry's law strikes again!

Muphry's law is an adage that states: "If you write anything criticizing editing or proofreading, there will be a fault of some kind in what you have written." The name is a deliberate misspelling of Murphy's law.

To return to the OP, this is an interesting case of an error being as meaningful as what was intended. Depreciate used transitively means to reduce the value of something, so someone who self-depreciates is talking him/herself down; very similar to self-deprecating.

But I am straying into Pedants' Corner.....

Exactly my point grumppa! I'm glad at least someone has 'got' my OP