zuo4cuo4 is the pinyin-notation for 做错 = doing wrong.
To my ear zuo4 and cuo4 sound very similar.
I need the IPA notation to understand the difference in articulation.
IPA just provides a set of letters and diacritics with descriptions of what sounds they represent.
It doesn't provide rules for how these must be used for any particular language. Hence you will find for many languages, including English and Mandarin Chinese, that many sources will use the IPA a bit differently.
The English Wiktionary doesn't yet provide IPA for this term but I'm requesting it. In the meantime, by piecing together pieces of other entries there I'd say the current editors working on Chinese would render it into IPA this way:
But I think tone sandhi is going to change it again so I'll provide an update when I have one...