idiom-requests
The Arabic idiom “OK, now you can show us the breadth of your shoulders.” has a meaning similar to get lost, but with a more humorous edge. The idea of the idiom comes from when the recipient turns around and walks out, or figuratively speaking: ‘gets lost’ and the speaker sees the back of his shoulders.
Is there anything similar in English?
It's not super common, but I have heard holding down the bed to mean "staying in bed for a long time". I don't think it necessarily implies illness, though; you could be holding down the bed just because you're lazy. Some example usages (bolding added):
And for anyone who thinks Lyme Disease is no big deal, I invite you to revisit a post I wrote last fall about the ugly, ugly realities of late stage Lyme - because I wouldn't wish this hell on anyone. Now hike up those socks and go have some fun for me. I'll be here at home, holding down the bed. (Source)
Had sickies around all last week, and am now sick myself. I have never been so sick! Gonna take me awhile to finish recovering, including housework! I at least looked over this last post, will be trying to think of creative ways to do these as I am holding down the bed! (Source)
To end this long and rambling story, I was sick and did not make the annual family Thanksgiving gathering. I did get a delivery of leftovers (Thanks Mom) but no family drama on the side. I spent the rest of the holiday holding down the bed or my miniature sofa. (Source)
However, it definitely isn't just used for illness. For some reason, this phrase as a synonym for "lying in bed" is especially popular for pets:
It's not quite a set phrase; there are some examples of the version holding the bed down (which I just noticed @JimmyJames mentioned in a comment), but holding down the bed appears to be the more common choice for figurative use (for example, an image search of "holding the bed down" has pictures of truck beds much more prominently displayed than sleepy pets).
Best Answer
"Don't let the door hit you on the way out" is a well-known (though a dismissive, impolite) 'humorous' phrase.
I think it implies that the door is a "swing door" (or, a door being slammed on them on the way out).
Some people would tell you there's another (American-English) variant of this phrase, i.e. "Don't let the door hit ya where the good Lord split ya".
I don't recommend this variant:
So this phrase is I think even more impolite than the one I suggested: Wiktionary describes it as a "nasty command to leave".
Unfortunately the type of "humour" even in the first phrase I suggested ("Don't let the door hit you on the way out") is a derisive humour: it is (in my opinion) mocking or belittling the person who you're dismissing. The phrase mentioned in the OP i.e. "show us the breadth of your shoulders" might (perhaps, I don't know arabic) allow the person to leave with dignity. If so then unfortunately I can't at the moment think of a corresponding English-language expression.