Real Dictionary

flaw
countable noun: A flaw in someone's character is an undesirable quality that they have.
countable noun: A flaw in something such as a pattern or material is a fault in it that should not be there.
countable noun: A flaw in something such as a theory or argument is a mistake in it, which causes it to be less effective or valid.

flaw in American English 1
a break, scratch, crack, etc. that spoils something; blemish
intransitive verb: to contract a flaw; become cracked or defective
noun: a feature that mars the perfection of something; defect; fault
transitive verb: to produce a flaw in

flaw in American English 2
a sudden, brief gust of wind, often with rain or snow; squall
noun: a sudden, usually brief windstorm or gust of wind

flaw in British English 1
noun: an imperfection, defect, or blemish
verb: to make or become blemished, defective, or imperfect

flaw in British English 2
noun: a sudden short gust of wind; squall