"Dekko" is British slang for "look" and can be used interchangeably with the word "glance". Other synonyms include "peek", "glimpse", "survey", "examine", "observe", and "inspect". These words convey a sense of taking a quick and casual look at something. "Peep" and "spy" imply a sneakier approach with the intention of catching a glimpse of something that may not be intended for public viewing. "Scanning" and "scrutinizing" indicate a more thorough look at something while "eyeballing" implies a visual assessment of something's worth or quality. Overall, there are many synonyms for the word "dekko" that can be used depending on the context and intention of the speaker.