/ ðəm; NAmE ; strong form ðem/ pronoun (the object form of they )
1.
used when referring to people, animals or things as the object of a verb or preposition, or after the verb be :
Tell them the news.
What are you doing with those matches? Give them to me.
Did you eat all of them?
It's them.
2.
used instead of him or her to refer to a person whose sex is not mentioned or not known :
If anyone comes in before I get back, ask them to wait.
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WORD ORIGIN
Middle English : from Old Norse theim to those, to them, dative plural of sá ; related to their and them .