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Could you tell me whether we can say "at the behind of something" to mean "behind something, at the back of something", or not?

I've looked up in a dictionary for a noun "behind", and I've only found "the bottom, buttocks".

When I googled it, I came across the phrase, which says "At the behind of the Cathedral, there's a church.", and about 500 other expressions like this.

Unfortunately, these expressions are mostly seen in non-native English web pages, well, mostly Japanese,
so I'm not sure if I can determine if this usage is gramatically correct.

My hunch's telling me, when you say "at the behind of something", it means "at the bottom of something, on the bottom surface of something" (eg. There's a sticker at the behind of my PS3) .
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Behind can be used like "next to" or "in front of." Jim in standing in front of Sarah. Sarah is behind Jim. The ball has fallen behind the couch. Look behind you!

You would not say "at the behind," just behind.

I can't imagine what those expressions in Google were, except errors, or special uses that combined things like at the "behind the scenes" tour.

(There is also "at the back of..." but that's different.)
When I googled it, I came across the phrase, which says "At the behind of the Cathedral, there's a church.", and about 500 other expressions like this.

Most of these pages are guides for towns, often written by someone who is not a native English user. Pity they don't submit their texts to this site Emotion: big smile
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The waiter is behind the bar, or he is back of the bar.
(no "at").

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I put on my bathrobe and slippers and went to the door. It was Brett. Back of her [i.e. Behind her] was the count.

The Sun Also Rises, by Ernest Hemingway
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I see.

Now, what about the meaning of "the behind" itself?
When you say, in a casual&informal way, "Which is bigger, your brain or your behind?"
"Behind" in this case is used to mean "your buttocks", right?

Can "the behind" also mean "your back" in the following example?
When you say "Watch your behind!", you are warning them, like "Be careful!" or "Watch your back!",
so "behind" here is indicating "your back, the part of your body", am I right?
"Behind" here doesn't mean your ass, does it? It's not a kind of a homophobic thing, is it?
No, when used as a noun, it's your buttocks, not your back.

If you said "Watch your behind!" I'd assume you thought I had an extremely large a** and you were afraid I was going to knock something over with it Emotion: smile
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Is it like this?

"I shall never forget what your family has done to me. Watch your behind, cos maybe I'll kick some a**, maybe I'll start with yours."

So, when you say "watch your behind", it's actually a kind of a threat. I see.

Thank you Ms.Grammer Geek, and thank you all.

P.S. God, I misread what you were saying, Grammer Geek.
That's not a threat, just telling them to mind his/her own buttocks cos it's too huge. I got it. Thank you.