their S1 W1 /ðə; strong ðeə $ ðər strong ðer/ BrE AmE determiner [possessive form of ‘they’]
[ Date: 1100-1200 ; Language: Old Norse ; Origin: theirra 'theirs' ]
1 . belonging to or connected with people or things that have already been mentioned:
They washed their faces and went to bed.
The twins spend all their time together.
People had moved back into their own homes.
2 . used when talking about someone who may be male or female, to avoid saying ‘his or her’:
Everyone is free to express their own opinion.
Each student will have their own course-work folder.
⇨ ↑ his (2)