We continue the section called Idioms (modismos). An idiom is an expression whose meaning is not predictable from the usual meanings of its constituent elements. They are mostly used in colloquial contexts.
In English, ahogarse en un vaso de agua, will be: to get worked up over nothing.
¿Alguna vez te has ahogado en un vaso de agua? ¿En qué situación? ¡Cuéntanos!
As always, you can leave your answers in the commentaries of this same post, in your learning journal in Kotoba Miners' Spanish subforum or as a reply in this image in Kotoba Miners' Facebook.