Definitions

1. noun

a person who bundles or groups together, especially in a careless or arbitrary manner

“The lumper at the warehouse was often criticized for his sloppy packaging methods.”

2. noun

a person who classifies or categorizes things, often in a way that is overly broad or general

“The biologist was frustrated with the lumper who had grouped her species together with others that were quite distinct.”

3. verb

to group or classify things together, often in a careless or arbitrary manner

“The editor lumpered the similar articles together into a single category for easier browsing.”