knight            
 noun [ C ] uk/naɪt/ us/naɪt/
 (英国的)爵士
a man given a rank of honour by a British king or queen because of his special achievements, and who has the right to be called "Sir"
  He hopes to be made a knight for his work at the Bank of England. 他希望因为他在英格兰银行的工作而被封为爵士。 
  (旧时的)骑士
(in the past) a man of high social position trained to fight as a soldier on a horse
  knights in black armour 身着黑色盔甲的骑士 
  (国际象棋中的)马
in the game of chess, a piece in the shape of a horse's head that moves two squares in one direction and then one square at an angle of 90°
 - More examples
 - Your king is in check from my knight.
 - He was made a knight of the Order of the Garter.
 - That nasty pin stopped me from moving my knight.
 - The knight cast the sword far out into the lake.
 - The princess was rescued by a handsome knight.
 
Idiom  
a knight in shining armouridiom  救星
someone who saves you from a difficult or dangerous situation
 knight       
verb [ T ] uk/naɪt/ us/naɪt/
 封(某人)为爵士
to give someone the rank of knight
  He was knighted for his work with famine victims. 他为饥荒难民操劳而受封为爵士。