(idiomatic) To not commit to a decision, to keep various options available.

To keep one's own business private; to be discreet, careful, or circumspect in what one says concerning one's own thoughts, deeds, or situation.

(idiomatic) To keep a secret; to refrain from speaking indiscreetly or carelessly; broadly, to refrain from speaking altogether.

(idiomatic) To be tough; to have endurance; to have the capacity to absorb stress or damage, but still be able to function.

(idiomatic) To stay out of trouble, especially by avoiding unlawful behavior.

(idiomatic, colloquial) To maintain daily routine and provide the necessities of life in a home or community.

(chiefly US) The right of individuals to possess firearms and armor.

(idiomatic) To hope for the best, to show support.

Used other than figuratively or idiomatically: see keep, one, head, down. / (idiomatic) To avoid trouble or attention.

Alternative form of stick to one's knitting