can't see the wood for the trees
Meaning: If you can't see the wood for the trees, you can't see the whole situation clearly because you're looking too closely at small details, or because you're too closely involved.
- I don't think we can see the wood for the trees at this stage, so let's get an outsider to take a look at the project and give us a progress report.
- Marcus is so focused on product details that he can't see the wood for the trees when it comes to the overall needs of the company.
Variety: This idiom is typically used in British English but may be used in other varieties of English too.