What does 是是 mean beyond 是? Is it just a typo?

Question

This question relates to the following snippet:

不约而同是一个成语，读音是是bù yuē ér tóng，意思是指事先没有约定而相互一致。
_{Baidu Baike，不约而同}

It introduces the chengyu (idiom) 不约而同, which means something like "doing something consistently, but without prior arrangement". I'm just wondering why 是是 is used here---I haven't seen this before, so maybe it just means 是? Or maybe it's a typo?

Question: What does 是是 mean beyond 是? Is it just a typo?

Putting 是是 into YouDao gives this example: 你认为将会是是错误的决策. Maybe it's more tentative than plain 是, like 看看 perhaps. I'm not clear on this.

Answer 1

As the comment and the other answer said it's definitely a typo.

Note that in highly informal daily conversations, a sequence of "是" or "好" can express impatience, or can indicate dismissal of other person's opinion (with an arrogant/inpatient/derogatory tone) despite repeatedly answering "yes". I'm not sure if such a pattern is also present in English though.

Example:

A: 你是不是脑子有问题啊? (Are you a idiot?)
B: 是是是是，你觉得是，那就是，不狡辩。(meaning: I don't give a ** about what you think.)

Answer 2

It is a typo here, but in some dialects 是是 means 是不是, which is another story.

Answer 3

"啊是是是"表示躺平，摆烂。accept whatever you said but did nothing.