N-COUNT （用绳索、布或其他材料打的）结 If you tie a knot in a piece of string, rope, cloth, or other material, you pass one end or part of it through a loop and pull it tight.
One lace had broken and been tied in a knot.
VERB 把（绳索、布或其他材料）打成结 If you knot a piece of string, rope, cloth, or other material, you pass one end or part of it through a loop and pull it tight.
He knotted the laces securely together...
He knotted the bandanna around his neck.
N-COUNT (挤在一起的)一群 A knot of people is a group of people who are standing very close together.
A little knot of men stood clapping.
N-COUNT （通常由害怕或激动引起的胃的）痉挛，郁结 If you feel a knot in your stomach, you get an uncomfortable tight feeling in your stomach, usually because you are afraid or excited.
There was a knot of tension in his stomach.
V-ERG （因害怕或激动而）痉挛，紧缩，使痉挛 If your stomach knots or if something knots it, it feels tight because you are afraid or excited.
I felt my stomach knot with apprehension...
The old dread knotted her stomach.
VERB （通常因担心或愤怒而肌肉等）紧张，紧绷 If part of your face or your muscles knot, they become tense, usually because you are worried or angry.
His forehead knotted in a frown.
...his knotted muscles.
N-COUNT （树枝上的）节子，博洛尼装饰柜，节疤 A knot in a piece of wood is a small hard area where a branch grew.
N-COUNT 节（船、飞行器和风的速度计量单位） A knot is a unit of speed. The speed of ships, aircraft, and winds is measured in knots.
They travel at speeds of up to 30 knots.
...thirteen knot winds.
PHRASE （使）感到迷惑不解；（使）急切 If you tie yourself in knots, you get very confused and anxious.
The press agent tied himself in knots trying to apologise.
PHRASE 结合；结婚 If you say that two people tie the knot, you mean that they get married.
Len tied the knot with Kate five years ago.