hidden mechanism
nounUK /ˈhɪd.ən ˈmek.ə.nɪ.zəm/
US /ˈhɪd.ən ˈmek.ə.nɪ.zəm/
A part inside something that makes it work but that you cannot see.
The toy car moves because of a hidden mechanism inside it.
OTHER MEANINGS
2. An unseen reason or process that makes something happen.
Scientists found a hidden mechanism behind the disease.
3. A secret plan or way of doing something.
The team used a hidden mechanism to win the game fairly.
4. A part of a machine that is covered or tucked away.
The clock's hidden mechanism was behind the wooden panel.