Happy as a clam
English Idiom
Meaning: Someone who is extremely happy or content. This phrase is used to describe a person who is in a state of great joy or satisfaction.
Origin: The phrase 'happy as a clam' is believed to have originated in the early 19th century in the United States. It's thought to have come from the longer expression 'as happy as a clam at high water,' which refers to the idea that clams are safest and most satisfied when the tide is in, making them less vulnerable to predators.
