›to have a problem with youreyes so that you see two of everything, usually because you are drunk or ill
（通常指因醉酒或疾病导致视力）出现重影I startedseeing double, then I fainted.
我的眼前开始出现重影，然后就晕了过去。Eyesight, glasses and lensesUsing the eyesThe eye and surrounding areaOptics, microscopy and lasers
by Colin McIntosh The advent of social media has seen a huge increase in the use of informal abbreviations, many recently added to the Cambridge Dictionary. We have always had abbreviations, of course. Well-known examples include IOU (for “I owe you”), used to give an informal written guarantee that you will pay back a sum of
obesity which results from incremental weight gain over a number of years More than just a holiday glow: Experts reveal taking a vacation can actually save your LIFE (but there is still a risk of ‘creeping obesity’)