chà y cối

Từ điển Việt Anh (Vietnamese English Dictionary)

	[chày cối]
		(thông tục) To reason absurdly and obstinately, to quibble
		mortar pestle
		unreliable; insecure; untrustworthy
			cãi chày cãi cối
			argue without foundation

(thông tục) To reason absurdly and obstinately, to quibble