This is the 2082nd most frequent Japanese word.
取れる
"取れる" means "to be able to be taken," "come off," or "be removed."
取れる in this sentence is used to express the ability to pick or remove an apple from the tree.
そのリンゴは木から取れるよ。
That apple can be picked from the tree.
取れる is metaphorically used here to express 'getting or taking a moment to relax'.
今日は仕事から解放されて、少し息が取れるね。
Today, being freed from work, you can catch your breath a little.
取れる indicates the property of the watch to come off or detach independently.