| COS | hit with a cosh, usually on the head |
|---|---|
| COS | (Judaism) conforming to dietary laws |
| COS | sign and endorse (another person's signature), as for a loan |
| COS | sign jointly |
| COS | one of two or more signers of the same document (as a treaty or declaration) |
| COS | signing jointly with others |
| COS | one of two or more signers of the same document (as a treaty or declaration) |
| COS | a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) |
| COS | in a cozy manner |
| COS | Italian financier and statesman and friend of the papal court (1389-1464) |
| COS | Italian financier and statesman and friend of the papal court (1389-1464) |
| COS | ratio of the adjacent side to the hypotenuse of a right-angled triangle |