Below the belt and Double-dealing

Below the belt adjective - Disregarding the rules (from the notion of an illegal low blow in boxing).

Double-dealing and below the belt are semantically related. In some cases you can use "Double-dealing" instead an adjective phrase "Below the belt".

Double-dealing adjective - Marked by, based on, or done by the use of dishonest methods to acquire something of value.

Below the belt and double-dealing are semantically related. Sometimes you can use "Below the belt" instead an adjective phrase "Double-dealing".