to favor one side or show partiality when dealing with a problem or mediating a dispute

To throw oneself into something; to run headlong into a situation or task

one-sided interest or enthusiasm; a situation where only one party is willing while the other is indifferent

confused or baffled; to not know what is going on

one-sided arrangement where only one party is willing or interested; literally refers to a barber's shoulder pole which has a stove for hot water on only one end

lit. only one end of the barber's pole is hot; fig. one party is interested but the other is not. In the past, street barbers carried a pole with their tools at one end and a charcoal stove for heating water at the other.