- noun. [in singular] British informal a quick look or glance: come and have a dekko at this.
The full OED says it is a slang word, originally Army slang, which makes sense, given that it comes from the "Hindi dekho, imperative of dekhnā, meaning to look." The British colonial soldiers must have brought dekko home with them. The OED etymology compares dekko to its second entry on deck as a noun, a colloquialism it defines as "a look, peep." It has similar roots, from the "Hindi dekha, meaning sight, dekhnā, meaning to see, look at."