IPA: //ˈkraʊdər//
KK: /ˈkraʊdər/
A person who pushes or crowds others, often in a physical space, or someone who entertains a group, like a fiddler.
The crowder pushed through the busy market to get to the front of the line.
The word 'crowder' originates from the Middle English 'crowde' (meaning to crowd or press together) and the suffix '-er' (meaning a person who). A crowder is a person who crowds or presses together.
Think of someone who 'presses together' a group — that's what a crowder does.