a sinus is a form of:

Claptrap



noun
1.
ពាក្យគ្មានប្រយោជន៍, សំដីគ្មានខ្លឹមសារ, ការអួត, សំដីឥតបានការ
ENGLISH MEANING
noun
1.
A trick or device to gain applause; humbug.
2.
A contrivance for clapping in theaters.
adjective
1.
Contrived for the purpose of making a show, or gaining applause; deceptive; unreal.