upsetter noun. [ʌp'sɛtǝ] E16.
[from UPSET verb + -ER¹.]
1. A person setting up as a worker. Scot. Only in E16.

2. Scot.
a. A person posting a placard. Only in E16.
b. A founder, an establisher. L16-E18.

3. A support, a prop. Scot. E-M17.

4. A person who or thing which upsets, overturns, or disturbs someone or something. M19.

[TahlilGaran] English Dictionary ▲