(idiomatic) An admonition to oneself to calm down when overly excited, especially in terms of romantic attraction.

Alternative form of be still my heart

To act cruelly in order to achieve a positive outcome in the future.

(idiomatic) Used when admitting something one might otherwise lie about, e.g. to keep up appearances or be polite. From "if the truth should be told".

Alternative form of proverbs run in pairs

Alternative form of proverbs run in pairs

Alternative form of be-all and end-all

(idiomatic) To behave or act naturally, without regard to how this behavior is perceived by others. / (idiomatic) To function physically and mentally as one normally does.

One could be someone's parent, said of a woman older than a man.

it is acceptable to break rules.