When trying to find antonyms for the phrase "puts in a nutshell," it helps to first understand what the phrase means. In essence, the phrase means to summarize something succinctly, usually to convey the key takeaway or essence of a larger piece of information. So, antonyms would be words or phrases that describe the opposite action, such as "expand upon," "elaborate," or "detail." Other antonyms that could apply might include "obfuscate," "confuse," or "muddy the waters," all of which describe actions that would make it harder to understand the essence of a piece of information.