This phrase is applied to someone who is very strong and resilient in the face of hardship or pain. It originated in the USA in 1918; it has been used in British English since 1933.
USA, 1990—a persistent or indefatigable person or phenomenon—refers to ‘Energizer Bunny’, the name of a battery-operated toy rabbit represented as never running out of energy, featured from 1988 in a television advertising campaign for batteries
Since the mid-20th century, with reference to garden tea parties, the phrase ‘cucumber sandwiches on the lawn’ and its variants have been used to characterise traditional Englishness.
means that, if one is unaware of an unpleasant fact or situation, one cannot be troubled by it—coined by the English poet Thomas Gray in An Ode on a Distant Prospect of Eton College, first published in 1747
UK, 1918—a malediction, typically uttered as a parting shot after a quarrel—seems to have originated as one child’s threat to another—the reason the word ‘rabbit’ was chosen is unknown
USA, 1979—the children’s ability to pressurise their parents into buying something, or doing something for them, by continuing to ask for it until their parents agree to do it—originally referred to television advertising targeting children
1941 in the sense ‘under the influence of alcohol’—aided by the phonetic similarity of ‘grip’ and ‘grape’, this phrase has, in the course of time, been coined on separate occasions by various persons, independently from one another
British English, 1843—The theatrical phrase it will be (or it will come) all right at night (or all right on the night) means the opening night will go well.