"get in over your head"?

[gxiang]

i listened to a piece of material with the topic on credit cards. i find it hard to understand what's "get in over your head" mean in

"you will also want to be careul about buying things with credit card you wouldn't normally be able to afford. Again, you can get in over your head and end up paying a large amount of interest."

[Tdol]

If you are in over your head, you cannot control things. Here, it would mean that you could have too much debt and get in trouble.

[rewboss]

The image comes from swimming. If you get into a swimming pool at the deep end, and you're not a strong swimmer, and the pool is deeper than you are tall, you might struggle. You'd be in "over your head", and you may even drown. Indeed, we often talk about people "drowning in debt".

[gxiang]

Thank you so much for your help. :)

[Gisbeth]

gxiang: Hello I'm Gisbeth and I'm studying english in chile. In my class we are looking for idimatic expessions, so where did you find "the" expression?? I mean where did you find "get in over your head"? I need to give and explanation, so, because of that I'm asking you, I want to give a good explanation...
Thank you...

[Mfundo]

I don't know if I'm out of line or what,but you may correct me if I'm wrong.
About this "get in over your head" thing,I think it means someone who is full of him/herself.

[gxiang]

Hi, Gisbeth
This expression comes from an example in an English English dictionary named <Oxford College Dictionary>.

[rewboss]

I don't know if I'm out of line or what,but you may correct me if I'm wrong.
About this "get in over your head" thing,I think it means someone who is full of him/herself.

Not in this case; the sentence talks about debt, and that has nothing to do with being full of oneself.

It may be South African idiom, but I've never heard that meaning of this expression before.