lettuce with long dark-green leaves in a loosely packed elongated head
"The salad bar offered crisp iceberg, red leaf, and tender cos lettuce to choose from."
A variety of lettuce with long, crisp leaves.
"The cos at the picnic brought their own chairs and snacks."
A cousin, cuz.
plural of co
In plain English: These are people who share a common purpose or work together on something.
"The cos gathered in the break room to discuss the project's timeline."
Usage: Cos (plural of co) refers to companies or collaborators; it's short for "companies" or "collaborators." Use it informally, often in business contexts like "We're partnering with several cos on this project."
because
"He didn't answer because he was afraid to speak out."
An island in the Dodecanese, Greece.
"The travelers sailed to Cos, a historic island in the Dodecanese region of Greece."
The word cos is a shortened form of cos lettuce. Its name likely comes either from the Greek island of Kos or from an Arabic term for lettuce.