to [fall|drop] by the wayside

https://tts.langeek.co/read?text=dG8gZmFsbCBieSB0aGUgd2F5c2lkZQ&hash=8373a4720e3f9b2cf673aa608c48a25b63a9e007&lang=en&cache-only=0&driver=googletts

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