| noun | a male deer, especially an adult male red deer |
| noun | adult male deer |
| verb | attend a dance or a party without a female companion |
| verb | give away information about somebody “He told on his classmate who had cheated on the exam” |
| verb | watch, observe, or inquire secretly |
| betrayer | noun | one who reveals confidential information in return for money |
| rat | noun | one who reveals confidential information in return for money |
| ratter | noun | a disloyal person who betrays or deserts his cause or religion or political party or friend etc. |
| ratting | noun | to furnish incriminating evidence to an officer of the law (usually in return for favors) |
| shit | noun | a coarse term for defecation |
| snitch | noun | someone acting as an informer or decoy for the police |
| snitcher | noun | someone acting as an informer or decoy for the police |
| spy | noun | (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors |
| spying | noun | keeping a secret or furtive watch |
| snooper | noun | a spy who makes uninvited inquiries into the private affairs of others |
| snoop | noun | a spy who makes uninvited inquiries into the private affairs of others |
| sleuthing | noun | a police investigation to determine the perpetrator |
| sleuth | noun | a detective who follows a trail |