cerrojo

noun
  1. A bolt or latch used to secure a door, window, or container by sliding into a catch or socket, typically operated manually to lock or unlock. noun
    He inserted the cerrojo to lock the door securely.
    The old house had a rusty cerrojo that needed replacing.
  2. A locking mechanism that prevents movement or access, often used metaphorically to refer to a safeguard or security measure. noun
    The new security system acted as a cerrojo, preventing unauthorized entry.
    Implementing strict policies served as a cerrojo against data breaches.