a series of tests to discover whether something is effective and safe a trial to make very small changes to something so that it works as well as possible to fine-tune an effect of a medicine that is not intended a side effect increased or stronger, especially about an emotion or effect heightened a small, hollow place that appears on a person's cheeks when they smile a dimple to gradually disappear, especially the effects of something to wear off to say something to someone that shows admiration, approval or respect to pay someone a compliment an excessively optimistic way of looking at something; only seeing the positive and pleasant things about a situation through/with rose-tinted glasses https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_default.swf