What does pull the knot snug mean?

The phrase "pull the knot snug" means to tighten a knot so that it is secure. It is often used in the context of tying knots in ropes or strings, but can also be used figuratively to refer to the act of making a commitment or agreement. For example, someone might say "we need to pull the knot snug on this deal" to mean that they need to make sure that all the details of the agreement are finalized and secure.