I've just been assisting on the 'Binds' module of the clean change company's training. One defintiion of a bind is:
"a pattern of behaviour that you feel unable to change that repeats over time that is unhelpful"
An addiction would be a good example of a bind in real-life. Feeling compulsed by something inside to continue to do something even when we know that it's not something we really want to do. There's a feeling of helplessness.