Which is "correct": Everybody should open their MOUTH when they see injustice./ Everybody should open their MOUTHS when they see injustice. Thank you.
Which is "correct": Everybody should open their MOUTH when they see injustice./ Everybody should open their MOUTHS when they see injustice. Thank you.
Actually, I don't think the gender-engendered invention of the singular 'they' was raised at all. The point was about singular or plural mouths
(though the comments on gender are valid).
The question can be rephrased thus: Is it:
Every man in the choir opened his mouth to sing. or
Every man in the choir opened their mouths to sing.
where I have substituted "Every man" for the OP's "Everybody".
I think from this it is more obvious that "their mouth" is correct, as Kondorosi implied.
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