be the spit of
be the dead spit of (someone)
To look exactly like someone else. Primarily heard in UK. Wow, you are just the dead spit of your mother! I was about to call you by her name.
be the spit (or the dead spit) oflook exactly like. informal
The full form of the phrase is be the spit and image of , perhaps coming from the idea of a person apparently being formed from the spit of another, so great is the similarity between them. This fuller form also lies behind the expression spitting image .