What is an idiom for great start but cheap/pathetic ending?
I have to write an article which I want to end with an idiom, but unfortunately, I can't think of any.
Background: A speaker of our "Event management committee" has spoken really nice about Humanity, being Human and Nature, but in the end, he used some poor examples which contradicted what he said and against Nature, humanity. He ended an amazing speech, with poor metaphor/analogy in support of castism, skin color, etc.
- ... and ended up being a damp squib.
- Let’s not mistake dying embers for being the spark of a revolution.
Japanese proverb: Dragon's head serpent's tail