What does こき mean?


I've seen こき being used in expressions such as in こき使う (with the meaning of
work someone hard) and 嘘こき (used to refer to someone who lies a lot,
apparently). I haven't found this expression's meaning in any Japanese
dictionaries, much less in Japanese-English ones. What does it mean and what's
its origin?




こき is the masu-stem of the verb こく, and こく should be in any dictionary.

  * 扱く in [Kotobank](https://kotobank.jp/word/%E6%89%B1%E3%81%8F-499035) and [jisho.org](https://jisho.org/word/%E6%89%B1%E3%81%8F-1)
  * 放く in [Kotobank](https://kotobank.jp/word/%E6%94%BE%E3%81%8F-499036) and [jisho.org](https://jisho.org/word/%E6%94%BE%E3%81%8F)

こき in 嘘こき is [masu-stem as a
noun](https://japanese.stackexchange.com/a/32311/5010).

Note that 扱く and 放く are different words although both are almost always
written in hiragana.




こき is the masu-stem of the verb こく, and こく should be in any dictionary.

  * 扱く in [Kotobank](https://kotobank.jp/word/%E6%89%B1%E3%81%8F-499035) and [jisho.org](https://jisho.org/word/%E6%89%B1%E3%81%8F-1)
  * 放く in [Kotobank](https://kotobank.jp/word/%E6%94%BE%E3%81%8F-499036) and [jisho.org](https://jisho.org/word/%E6%94%BE%E3%81%8F)

こき in 嘘こき is [masu-stem as a
noun](https://japanese.stackexchange.com/a/32311/5010).

Note that 扱く and 放く are different words although both are almost always
written in hiragana.

