Below the belt and Off-color

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

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

Off-color adjective - Hinting at or intended to call to mind matters regarded as indecent.

Below the belt and off-color are semantically related. Sometimes you can use "Below the belt" instead an adjective phrase "Off-color".