The phrase "a rag on" is correct and usable in written English.
It is typically used in informal contexts to mean to criticize or make fun of someone or something.
Example: "He always has a rag on his coworker for being late to meetings."
Alternatives: "give someone a hard time" or "make fun of".
With a rag on his head, he was hawking invisible goods.
[Pops hood and secures prop arm.] I'll be back in a sec; there's a rag on the planter box if you want to check the dipstick.
As in the criminal case, the gun that Garcia Zarate found in a rag on the pier has been central so far in the wrongful death lawsuit the Steinle family filed in 2016.
You do think 'Shit, if our plane had landed half an hour earlier, that could have been my bag sitting there.' I saw a chap with a bloodied arm, and someone with a rag on his head, but nothing catastrophic.
Curtis Lawrence spoke of a similar feeling while washing his 10-year-old Buick sedan with a bucket of soapy water and a rag on the streets of East New York, Brooklyn, a few nights ago.
With a small budget, the company has focused on spinning out lighthearted solutions to situations — like countering boredom by focusing on a bouncing ball or hangovers by staring at a rag — on its Web site, videos, bus shelters and other advertising and in the store windows of Ricky's, a New York beauty supply company.
The trail was easy — he had signed every stone, Left us a rag of flesh on every thorn.
AS cover-ups go, this one was about as effective as a wash rag on a sumo wrestler.
A "damp rag" on a coat of arms would not look nearly so clever.
In the lowest cavern, through an ancient stone doorway, is the "wishing rock", where if you throw a silk rag on to a lit candle on the stone, we were told, your wishes come true.
Away from him, she is utterly debilitated, a rag doll on a floor.
