They pron. pl.; poss. Theirs; obj. Them. The plural of he, she, or it. They is never used adjectively, but always as a pronoun proper, and sometimes refers to persons without an antecedent expressed.
Jolif and glad they went unto here [their] rest
And casten hem [them] full early for to sail. --Chaucer.
They of Italy salute you. --Heb. xiii. 24.
Blessed are they which do hunger and thirst after righteousness. --Matt. v. 6.
Note: ☞ They is used indefinitely, as our ancestors used man, and as the French use on; as, they say (French on dit), that is, it is said by persons not specified.