Domestic relationships of all sorts might work a lot better by having a safeword in case an argument starts to hurt someone too much. To disrespect a safeword would be grounds to dissolve the relationship. It’s got to be that serious.
A safeword is sort of like a “block” at Occupy general assemblies.
It means you have gone too far and this situation is in danger of losing my continuing participation. Let’s call it a radically mindful slap.
The original idea for safewords comes from the kink sub-culture. Emphasis mine.
A safeword is a code word or series of code words … to unambiguously communicate their physical or emotional state … typically when approaching, or crossing, a physical, emotional, or moral boundary.
~abbreviated from Safeword from Wikipedia [to make this post safe for work]
In any case boundaries of every sort need to be negotiated.
Might be a good idea for friendships and other situations too.