What big idea is associated with Sigmund Freud?

Psychological repression. And how about "anal retentive" ? And the Oedipus complex-- being unconsciously sexually attracted to the parent of the other gender? And what about the role of "ego" in developing personality? Or phallic symbols... anything longer than it is wide represents a phallus. Except a cigar, of course. Because a cigar is just a cigar !