Why do we swipe left?

Beau Brummell, denouncing the fashion for a vegetable diet, was asked if he had never tried it himself: ‘Oh yes, I remember I once ate a pea.’ His remark sounded funnier then, because the normal way of talking about the little green spheres was as a collective, pease, as in pease pudding. Brummell was not the first to talk of one pea. Robert Boyle, the natural philosopher, wrote in 1666 of a bud the size of a pea. Alternatively a single example was called a pease.

I mention peas because their harvesting was done in the 18th century with two implements: a pix (shaped like a pickaxe, I suppose) to pull the pea vine towards the harvester, so that with the right hand it might be cut with a swipe.

It’s this swipe that has ended up as a word for the flicking motion of the finger across the touchscreen of a mobile phone.