(dated slang, euphemistic, 1920s, African-American Vernacular) To have sex. / To play rock and roll music. / To start, commence, begin, get moving.

A relationship in which two parties closely monitor and challenge one another in a suspicious or self-protective manner, often because each party is attempting to gain an advantage over the other.

A children's game in which one player (the "cat") attempts to break through a ring of players to catch another player (the "mouse") in the centre.

Alternative form of cat-and-mouse

(biochemistry, steroids) Any natural or synthetic compound, usually a steroid hormone, that stimulates or controls the development and maintenance of masculine characteristics in vertebrates. A male sex hormone such as testosterone or anabolic steroids.

(nautical, traditional) Tidily tied down and secure. / (figuratively, or by extension) Properly and neatly organised or arranged.

(collectively) All; everyone. / (separately) Each one.

A depiction of a sickle crossed with a hammer, used as a symbol of communism and the Soviet Union. / (metonymically) Socialism or communism itself.

(cricket) Out by being caught by the bowler.

(Rastafari) You and I; we. / (Rastafari) Jah (God) and I.