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Discover LudwigThe part of a sentence "their birthday" is grammatically correct and can be used in written English.
It refers to the birthday of multiple people. Example: "They all gathered to celebrate their birthday together."
Exact(59)
Or their birthday.
They will certainly enjoy their birthday.
"On their birthday, I had a court date," he said.
This week brought something new: plaintiffs in their birthday suits.
She could have bought one of their birthday cards.
People have parties on their birthday, everyone makes a fuss.
-- I don't look forward to their birthday parties.
Who'd choose to share their birthday with a volcanic landmass?
I used to bring my kids there on their birthday.
It had a starring role at one of their birthday parties.
Children wrote to Lambert begging for Daleks to visit their birthday parties.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com