(idiomatic) Far less important or capable than one thinks or claims oneself to be.

(humorous) A statement that not only will the person being addressed be punished but their conspirators will also.

One is never too old to change one's ways; learning is always possible.

(idiomatic) Used to apologize for a possibly impolite statement one is making.

An expression of mock sympathy.

Something enjoyable or beneficial which, nevertheless, becomes bothersome or harmful in large quantities or over an extended period of time.

(idiomatic) Too expensive or fancy to suit one's taste or preferences.

(idiomatic) To try to fill more roles at once than is realistically possible.

Alternative form of this too shall pass

Third-person singular simple present indicative form of wear too many hats