Equivalence
Often, when we encounter something new, we describe it my comparison to something that we recognise. A turnip?- well, it's a bit like a swede. We Britons living in Spain often use this equivalence for things Spanish. Sometimes the idea is spot on; IVA and VAT, the sales tax, is alike in all but name and rate. It doesn't work for lots of things though. The car roadworthiness test for instance, the ITV, isn't really much like the MOT but it's sort of the same and we know what we mean. And MPs are not a bit like Spanish diputados except that they are the rank and file national politicians. After all the blue whale and the field mouse are both mammals, they suckle their live born young, but they're not quite the same. Morning, afternoon and evening are different too. If the plumber says they'll be around in the afternoon then you shouldn't give up on them till about 8.30pm just like 1.30pm is still very much morning. I still get caught by someone saying we must ...