A conjunction meaning that as one thing progresses or changes, another thing changes or occurs in proportion; often written as "につれて."
年を取るにつれ、体力が落ちてきた。
As I got older, my physical strength declined.
雨が強くなるにつれ、川の水位が上がってきた。
As the rain got heavier, the river's water level rose.
町が発展するにつれ、昔ながらの店がだんだん少なくなった。
As the town developed, the old-fashioned shops gradually decreased.
観客が増えるにつれ、会場の熱気も高まった。
As the audience increased, the excitement in the venue also rose.