falls, fell, fallen, falling

to fall off
phrasal verb

Detach or become separated from something
  • 1The button fell off my shirt.
  • 2The wheel might fall off if it's not fixed.
When something falls off, it means that it becomes disconnected or separated from something else. For example, if a leaf falls off a tree, it means that the leaf has detached from the tree and is no longer connected to it.
Card
Remember that "fall off" is often used for things that were originally attached or connected to something else. So if you see something "fall off," think about what it was separated from.
at a jewelry counter
The Missing Gem
Ronald
Hey Steven, I just noticed the diamond from this ring is missing.
Steven
Oh no, it must have fallen off when you were trying it on.
Ronald
I hope it didn't get lost; it was such a beautiful piece.
Steven
Let's check around the counter; it might still be here.
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Similar to "to fall off":
  • 1detach
  • 2come off