English definition of “better”
› comparative of well adverb: to a greater degree, or in a more successful or effective way: I'd like to get to know you better. Helen did much better than me in the exam.
he/you, etc had better do sth › used in order to say what you think someone should do: You'd better hurry or you'll miss the train.
know better › to have enough experience not to do something stupid or something that will not achieve anything: I thought she'd listen to me - I should have known better.