I was changing the back light bulb on my car ,and I was struggling to unbutton this button-shaped thing . what do you call this button-shaped thing in English?

It looks like a tack or a fastener. The car manufacturer might have a specific name for it. ( I'm curious to know )

button-shaped thing

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    I'd call it a stud fastening / clip / closure (push the stud "head" in and it "locks", pull it out and the outer part can be detached). – FumbleFingers Mar 9 '16 at 15:44
  • @FumbleFingers , exactly – KF2 Mar 9 '16 at 15:49
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    I put fastening first because I'd be more likely to use that in the context of the thing that holds the car boot lining in place, but I'd probably say stud clip n the context of, say, earrings. And stud closure in more "abstract" contexts where you're just talking about how two sheets could be bonded along an edge (in an engineering drawing, say). – FumbleFingers Mar 9 '16 at 16:15
  • @fumbleFingers , thanks. fastner bumper push clips or something like that aliexpress.com/w/wholesale-push-clips.html – KF2 Mar 9 '16 at 16:44
  • If it's pulled it "could" be what is called a blind rivet. But it does look like common plastic fastener used a lot in automotive applications. – user116032 Mar 9 '16 at 19:36

It is called a rivet fastener. If it is plastic, you can call it a plastic rivet fastener. If it is metal, you can call it a metal rivet fastener.

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  • You are answering your own question? – NVZ Mar 11 '16 at 5:22
  • @NVZ, that's what I found after I had asked the car service center . – KF2 Mar 11 '16 at 16:19
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    @NVZ It's acceptable and even encouraged in the right context. See this link. – Lawrence Mar 11 '16 at 17:09
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    @Lawrence Thanks, I didn't know that. – NVZ Mar 11 '16 at 17:12

A blog post titled Peugeot 206 Rear Light Replacement shows the actual image you posted in the question. In it they call it a plastic bung. But rivet fastener seems like the better name here since bung may not be understood by many.

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  • I actually came across the same phrase " plastic bung " , but some of my native English speaker friends told me it seems to be wierd . – KF2 Mar 11 '16 at 16:34
  • I see. Bung may not be used internationally. But I just wanted to show you what the blogger himself called it. – NVZ Mar 11 '16 at 16:35

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