(UK) To increase fuel or power to an engine, as to a car by depressing the gas pedal. / (UK) To apply great physical effort to (something).

(idiomatic) To emphasize or underscore; to make something even better or worse.

(idiomatic) To begin, especially used to launch a performance of some sort (usually imperative and/or exclamatory).

(idiomatic) Some things need the active cooperation of two parties; blame is to be laid on both parties in a conflict.

(idiomatic) No other possible action, choice or option. / (idiomatic) No other possible interpretation.

(idiomatic) Easy; simple or straightforward.

Initialism of Independent Television Authority. / (education) Initialism of Initial Teaching Alphabet.

(idiomatic) To improvise; to make things up or figure things out as one goes; to perform with little or no preparation.

You can show someone how to do something, but you can't make them do it.

(idiomatic) To have a great time; to party or revel excessively or noisily.