Season 3 · Episode 11
The Simpsons
Burns sells the power plant to a German corporation that doesn't care for Homer's approach to his work.

A mild exclamation of surprise, alarm, or dismay. Widely used across Latin America and understood everywhere. Not offensive. Often signals that something has gone unexpectedly wrong.
A fixed adverbial phrase. Although the words are simple, 'a diario' is a set expression that functions as a single adverb and is more idiomatic than the sum of its parts in everyday Latin American speech.
Used in the phrase 'la espada de Damocles pende sobre su cabeza,' a formal literary expression meaning a constant hidden threat. 'Pender' alone means to hang or dangle, but in this phrase it takes on a figurative, ominous sense that is not obvious from the verb alone.
In context it appears in the fixed strategic saying 'mantén cerca a tus amigos y más cerca a tus enemigos,' the Latin American Spanish rendering of that well-known saying. On its own 'mantener cerca' is transparent, but the full phrase carries a cultural weight worth knowing.