(idiomatic) Ready if needed, in reserve, prepared, available for use whenever it might be advantageous.

(humorous) The supposed reason for a person using the pronoun we when really speaking only about themselves.

To make an alveolar trill sound for the letter r.

To experiment in life; to find out what one is capable of.

Of an infant: to begin to support oneself on the legs, a prerequisite to walking.

(idiomatic) Alternative form of bare one's teeth

To be sullen or sulky.

(idiomatic, slang, chiefly imperative) To stay calm; to not get flustered or angry.

(archaic, slang) To pay for another person's drink as part of drinking socially.

To be acquired or achieved with great ease.