rattlecap
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
An unsteady, volatile person.
Register: slang
Where it’s used:
Used
American English
Examples
I should write oftener but that my sister Sarah has become such a rattlecap, that she leaves me not a particle of news. Upon my word, she is the greatest talker extant. I am a perfect silence compared with her.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “rattlecap” mean?
An unsteady, volatile person.
Is “rattlecap” formal or informal?
rattlecap is generally slang.