Trigger points are fairly common and are tight knots of muscle fiber that can't relax. (myobuddy.com)
Watching those supernovas will help theorists understand how raging star birth and death occur in tight knots in the more distant universe. (sciencemag.org)
When your milk does come in it will feel like tight knots in the corners of your breasts below your armpits. (mymommystyle.com)