To Stay The Night
To Stay Over, To Sleep Over
intransitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means overnight and the verb vocab version is to stay the night.
We are just going to stay tonight (と) and maybe tomorrow (と) night.
今までで一番面白い最高傑作のお笑いのDVDを買ったんだけど、今日うちに泊まって一緒に観ない？
I bought a DVD of the funniest comedy skits ever, so why don’t you stay over and watch it with me tonight?