(set phrase, colloquial) Suddenly, quickly, without warning.

Any human-made weapon causing indiscriminate large-scale death or destruction, especially a biological weapon, chemical weapon, nuclear weapon or radiological weapon.

(idiomatic) In summary; ultimately.

The season or time made up of the twelve days between Christmas and Epiphany; Christmas season, Christmas time, Christmastide, Twelvetide. The Christmas season traditionally ended with the feast of the Epiphany on January 6.

(in the negative) To fail to make head or tail of; not to understand at all.

An archipelago off the coast of Cornwall, in southwestern England.

(idiomatic, chiefly in the negative, with can't/cannot) To understand even minimally. / To determine to be good or bad.

Alternative form of in two shakes

(idiomatic) An outburst of clapping among a group or audience.

(idiomatic, humorous) An expression sometimes used when a person mentioned in the current conversation happens to arrive on the scene.