Other forms: figures of speech
A figure of speech is a phrase or saying that's not literal, like saying someone who died "kicked the bucket."
Language is full of terms, phrases, and sayings that might seem odd if you don't already know what they mean. When you say you're hungry enough to eat a horse, it's doubtful you mean that literally: it's just a figure of speech. When you say it's raining cats and dogs, pets aren't falling from the sky: it's a figure of speech. English is full of figures of speech, which are definitely not a case of language going to the dogs.