bell cow

noun
  1. a cow, especially the lead cow of a herd, having a bell attached to a collar around its neck so that the herd can be located easily.

Origin of bell cow

An Americanism dating back to 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for bell cow

Historical Examples of bell cow