somebody
n.n. an unknown or unnamed person. You use this when you are talking about a person but you do not know exactly who they are.
n. an unspecified or unknown person. Functions as a singular pronoun and is often used in affirmative statements.
Somebody left their umbrella in the hallway.
I heard somebody knocking on the front door late last night, but no one was there when I looked.
The success of the project depends on somebody taking full responsibility for the final report, yet no one has volunteered for the role.
From Middle English sum body, equivalent to some + body.
Functions as a singular pronoun; typically takes a singular verb but is often followed by the gender-neutral plural possessive 'their'.
Somebody have my keys.Somebody has my keys.Indefinite pronouns like 'somebody' are grammatically singular and require a singular verb.