一気 いっき呵成 かせい
ikkikasei

Noun
Adverb

1. finishing writing, work, etc. at a stroke (stretch); knocking something off without a break

Yojijukugo
かれ、一気 いっき呵成 かせい げたと ってたけど、この提案 ていあん しょ、少 すこ ざつだね。
kare ikkikasēni kakiagetato ittetakedo kono tēansho sukoshi zatsudane.
He said he dashed this proposal off in one sitting. It's pretty sloppy.
Other forms: