1A chain — a series of connected metal links used to fasten, secure, or connect objects.
自転車を鎖で柱に繋いだ。
I chained the bicycle to the post.
犬に鎖をつけて散歩に行った。
I put a chain on the dog and took it for a walk.
古い鎖がさびて、今にも切れそうだ。
The old chain is rusted and looks like it could snap any moment.