Spitting Image
(SPIH-teeng IH-muhj)
Definition: When someone is the "spitting image" of someone else, that means they both look like and have the personality of that person.
Origins: The phrase actually started out as "spirit and image," it just changed a little over time.
Sentence: Kai was the spitting image of Sierra, which made things all the harder for Robert.
(Note: you will find out who Kai and Robert are soon enough, reader.)