knot2 past tense and past participle knotted, present participle knotting
to tie together two ends or pieces of string, rope, cloth etc:
A pretty scarf was loosely knotted around her neck.
if hair, a thread etc knots, it becomes twisted together
3 [intransitive and transitive]
if a muscle or other part of your body knots, or is knotted, it feels tight and uncomfortable:
Fear and anxiety knotted her stomach.