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Which is correct, make up their mind or make up their minds?
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Hi

both are idiomatic
You can inflect the verb and noun of an idiomatic phrase, it is not fixed.
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I prefer "their minds", though, yes, both seem ok

Why do both plural and singular make sense there? ?

I'm totally bewildered by such kind of stuff.
"Why do both plural and singular make sense there? ?"

Maybe because "their" can refer to both singular and plural antecedents.
Alienvoord"Why do both plural and singular make sense there? ?" Maybe because "their" can refer to both singular and plural antecedents.
And perhaps sometimes their mind is same, while other times their minds are different, but all been made up then.[:-P]Emotion: big smile
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Similarly, it's possible that some speakers would choose "make up their mind" when each person had to make the same decision, but "make up their minds" when the decisions related to different matters. For example:

1. I spoke to Mr and MrsQ last night. They still haven't made up their mind whether to come over this weekend.

2. I spoke to Mr and MrsQ last night. They still haven't made up their minds what they want for Christmas.

(Sorry to mention "Christmas" at this time of year.)

MrP
MrPedanticSimilarly, it's possible that some speakers would choose "make up their mind" when each person had to make the same decision, but "make up their minds" when the decisions related to different matters.

Yes, not all speakers would choose "make up their mind" when each person had to make the same decision.

We made up our minds that, if business didn't get better by June, we'd sell it. (Longman Advanced American Dictionary)

In the above sentence, each person made the same decision.
Yes indeed. If there is a rule of some kind that native speakers obey, I suspect it would take many hours with electrodes and Poisson distributions to get to the bottom of it.

MrP
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