Definition of "Flaw" :

noun: an imperfection in a plan or theory or legal document that causes it to fail or that reduces its effectiveness

noun: defect or weakness in a person's character

"He had his flaws, but he was great nonetheless."

noun: an imperfection in an object or machine

"A flaw caused the crystal to shatter."

verb: add a flaw or blemish to; make imperfect or defective