1. parts of a company or organization that operate in isolation from others
working in silos can lead to poor communication between departments
As a noun, a 'silo' is an area used to store grain or food on a farm or an underground area where weapons are stored. As a verb to silo something means to isolate or separate a team, process, or department from others. This is a formal expression you will wear off in here used in corporate or business contexts.