Wiktionary
vb. 1 (context transitive and intransitive English) To become detached or to drop from. 2 (context intransitive English) To diminish in size, value etc. 3 (context nautical English) To change the direction of the sail so as to point in a direction that is more down wind; to bring the bow leeward.
WordNet
Usage examples of "fall off".
If I can somehow get this bubble to fall off the back of this truck, thought Raymond, it will surely break when it hits the road and then I shall be free.
The man gave a loud shout that almost made Julian fall off the rung he was standing on.
They roamed the lower decks, padding down miles of carpeted corridors and metal-floor passages, looking at empty rooms, empty storage areas, and rooms filled with confusingly noisy machinery until Tremaine's feet were ready to fall off.
This, at a time when Italy was unsettled and in a certain kind of suspense, might be well enough done, but I do not take it at this time for any precept for us, being clearly of opinion that the making of factions never does good, but that, where the enemy approaches and the city is divided, it must necessarily, and that suddenly, be lost, because the weaker party will always fall off to the enemy, and the other cannot be able to defend it.