A. She got their hair done.
I am wondering what done really mean here.
Thanks
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Sign up to join this communityIn this case, it simply means that she had her hair styled or trimmed. Basically, a trip to a hairdresser.
Likewise, a particular hairstyle, especially a complicated or distinctive one, is often referred to as "a do".
The construction "I got my ___ done" is a common construction with several different meanings depending upon what fills in the blank.
1) "I got my hair done", "I got my nails done", "I got my toes done": the speaker went to a professional who specializes in the cosmetics of that body part (hair, finger nail, toe nails, etc.).
2) "I got my chores done", "I got my work done", "I got my errands done": the speaker is the person who completed a task (chores, work, job, etc.), which is typically a daily task or an assigned task.
3) "I got my taxes done", "I got my books done": the speaker had a professional complete some task of theirs that is often considered a burden, usually in a business or professional setting.
As you can see, 1 and 3 are pretty similar, but are used in very different contexts and usually by very different people. See the Google n-gram results on which of these is the most common.