| 1. | a line on a contract or similar document for a party's signature. |
| 2. | a line at which a sheet of paper is perforated or a piece of it is to be detached. |
| 3. | signature on the dotted line, full agreement to terms and conditions. |
| 4. | sign on the dotted line, to agree fully to terms or conditions. |
sign on the dotted line
Agree formally or fully, as in The deal is just about fixed; all they have to do is sign on the dotted line. This idiom refers to the broken line traditionally appearing at the bottom of a legal document, indicating the place for one's signature. [Early 1900s]