sake bottle
銚 centers on a specific type of container: a sake bottle, often a metal or ceramic vessel used for serving or warming sake.
銚 combines 金 (metal) with 兆, which likely contributes the sound. It originally referred to a metal vessel, consistent with the sake bottle meaning.
The left side 金 (metal) suggests a metal container, and the right side 兆 looks like a bottle with a stopper. Picture a metal sake bottle with a distinctive shape.
For チョウ, imagine a long-serving sake bottle named Chou: Chou -> チョウ, and the metal bottle is always ready for a pour.