there's no way; that's impossible
Expresses strong disbelief or impossibility about a situation, often translated as 'there's no way' or 'that can't be true.'
まさか (masaka) is used when you are astonished and cannot believe something. It can be a standalone exclamation, like when you hear shocking news, or it can introduce a clause that states the impossible thing. For example, if a friend says they failed the exam, you might say まさか! to mean 'No way!' It is often followed by negative expressions like ない or はずがない to emphasize impossibility, as in まさか、彼がそんなことをするはずがない (masaka, kare ga sonna koto o suru hazu ga nai) meaning 'There's no way he would do such a thing.'