to [fall|drop] by the wayside

https://tts.langeek.co/read?text=dG8gZmFsbCBieSB0aGUgd2F5c2lkZQ&hash=26e0cb4e6be5ccc30aa36fa11a719af1d45d4a0e&lang=en&cache-only=0

Master English idioms that relate to lacking effort, like "run out of steam" and "take a back seat".