Meanings
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1
det
Belonging to or relating to a thing, animal, or idea already mentioned
The dog wagged its tail happily.
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2
pron
The one or ones belonging to it
Every country protects its own borders, and this one protects its.
Etymology
Equivalent to it + -s (possessive marker). From the earlier form it's (it + -'s), which is now considered nonstandard. Began to displace his as the possessive of the neuter pronoun in the Middle English period; had fully displaced it by the 1700s.