Noun, Adverb (fukushi)
any and every thing; altogether; lock, stock, and barrel; the whole shooting match; the whole kit and caboodle; without reserve
Yojijukugo (four character compound)
この見積もりは経費一切合切を含めたものでしょうね。これ以上はびた一文お金は出さないからね。I hope this expense report contains all the relevant business expenses because I'm not paying a cent more after this.
Also written 一切合財【いっさいがっさい】