Comprehensive resource for understanding and mastering English idioms
The idiom "bug-eyed" means to have wide, staring eyes that are fixed on something. It can also mean to be surprised or shocked, often to the point of being unable to speak or move. The figurative meaning is used to describe someone who is very eager or enthusiastic about something.
The idiom "bug-eyed" originated in the early 19th century and was first used in literature by William Makepeace Thackeray in his novel "Vanity Fair" published in 1820. In the novel, it is used to describe a character who is excited and enthusiastic about something. Over time, the idiom's usage has broadened to include being scared or shocked as well.