"Search me" is a colloquial phrase that is commonly used to express ignorance or lack of knowledge about a particular thing. However, there are several synonyms for this phrase that can be used interchangeably. Some of these synonyms include "beats me", "I have no idea", "I haven't a clue", "your guess is as good as mine", "I'm stumped", "I'm in the dark", "I'm clueless", and "I'm not sure". These phrases can be used in various contexts, whether in casual conversations or formal settings, to express confusion or uncertainty. Using these synonyms can help convey a similar message as "search me" while adding more variety and depth to your vocabulary.