The attitude of a know-it-all.

plural of know everything

(South Asia) let's learn, find out, or see [about] / (colloquial, rare) let us know, get back to us, keep us posted (often us in sense me)

Alternative form of you know what

Alternative form of know-everything

Alternative form of I don't know

present participle of know better

(chiefly US, derogatory) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.

(informal) To be aware of a situation, especially of the consequences of misconduct.

The knowledge and skill to be able to (do something correctly).