In your example, window probably means "a period of time when an opportunity was available." But because it's written in past tense, "you HAD a window," it means that the opportunity has passed. For example, if you are a man, and a woman tells you that you had a window after she broke up with her boyfriend, it means that you had a chance with her then but not anymore.
It mean you do not mean it
could eat a horse
not worth consideration; unimportant:
Hyperbole
A figure of speech
Alliteration and personification
It is generally used as a figure of speech to mean that what is being said is nonsense.
of or involving a figure of speech, especially a metaphor; metaphorical and not literal
This figure of speech means that the person was proved wrong. This is true especially if the person in question was bragging, and proved wrong by someone else.
Tagalog Translation of FIGURE OF SPEECH: tayutay
figure of speech according to categories
Window is a noun.