A piece of hard candy attached to a stick that you hold while licking it.
From English dialect 'loll' (to move tongue or roll) plus 'pop' (to move quickly or strike), possibly influenced by the Roma word 'loli' meaning 'red.' The word emerged in the early 1800s to describe the action and object together.
Lollipops became wildly popular during the Great Depression when they were cheap treats, and their name is onomatopoetic—'loll-i-pop' mimics the actual sounds of lolling your tongue and the candy popping in your mouth, making the word almost a playful instruction manual.
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