To take further actions remaining after an event; to continue, revisit, or persist; especially, to maintain communication or verify.

Used other than figuratively or idiomatically: see up, to, here. / (idiomatic) overwhelmed, busy, buried or swamped / Used as an intensifier

(idiomatic, intransitive) To laugh heartily. / (idiomatic, transitive) To cause to laugh heartily. / (intransitive, idiomatic) To become insane; to suffer a mental breakdown.

(New Zealand, colloquial) Funny; hilarious

(colloquial) Excessive(ly); too much.

(UK, mildly vulgar slang) A mistake.

(transitive, intransitive, chiefly Britain, New Zealand, Australia, slang, mildly vulgar) To ruin (something) unintentionally; to fuck up, mess up, or screw up.

Armed for battle; prepared for or engaged in warfare. / (figuratively) Angry; incensed; preparing for a fight.

Alternative spelling of up-to-date

(idiomatic, transitive) to strengthen or reinforce; to add substance to