Rattlesnake
/ˈrætəlˌsneɪk/
Synonyms
- viper
- crotalus
Slang Meanings
To rattle someone (figuratively) means to disturb or upset them.
The unexpected news rattled him completely.
Rattler can sometimes refer informally to a rattlesnake or someone who is seen as dangerous.
Watch out for that guy; he's a real rattler when he's angry.