steal someone's identity
To assume another person's identity, usually to gain access to that person's finances or to frame a person for a crime; to commit identity theft.
identity
UK /aɪˈdɛntɪti/ US /aɪˈdɛn(t)ɪti/
noun 5
Definitions
noun
1
Sameness, identicalness; the quality or fact of (several specified things) being the same.
[…] suggesting the two are different stages of the same species. The identity of the two species is further suggested by allozyme analysis […]
2
The difference or character that marks off an individual or collective from the rest of the same kind; selfhood; the sense of who something or someone or oneself is, or the recurring characteristics that enable the recognition of such an in
I've been through so many changes, I have no sense of identity.
This nation has a strong identity.
3
A name or persona—a mask or appearance one presents to the world—by which one is known.
This criminal has taken on several identities.
In this show, the competitor's identity will remain secret until after the vote.
4
An equation which always holds true regardless of the choice of input variables.
The equation (x+y)(x−y) = x²−y² is an algebraic identity. It is true regardless of the values of x and y.
5
Any function which maps all elements of its domain to themselves.
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