Fall down, Fall off e Fall out of: Qual é a diferença?

Gostaria de saber qual a diferença no uso de fall down, fall off e fall out of.

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Avatar do usuário Cinnamon 15385 15 40 348
São phrasal verbs, quando uma palavra preposição/advérbio modifica o verbo, nos casos abaixo fall não foi modificado drasticamente em nenhuma das três:

fall down
Just emphasizing the verb = cair no chão, desabar;
Mas, pode ter outra conotação "be shown to be not true or not good enough
And that's where the theory falls down."

fall off
To decrease in quantity or quality = cair no sentido de decrescer, diminuir;
Attendance at my lectures has fallen off considerably.
opposite rise

fall out
1 to become loose and drop = se soltar e cair pela gravidade;
His hair is falling out.
My tooth fell out.
2 if soldiers fall out, they leave their lines and move away = descer de posição o sair das linhas de frente numa batalha
3 fall out of bed = cair da cama
He was so drunk and fell out of his bed.
Source Oxford Dictionary

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Avatar do usuário Juliana Rios 18850 21 98 389
Addendum:

The differentiation between "fall off" and "fall out of" is much less arbitrary when we describe the physical act of falling. In this sense, it can be said that:

People or things fall out of places which they are in. E.g.:

Last night I fell out of bed (because we lie in bed).
The construction worker fell out of the elevator (enclosed space).


People or things fall off surfaces which they are on. E.g.:

Be careful not to fall off (the roof).
The vase fell off the shelf.
If you slip or trip, you might fall over:
I slipped on the ice and fell over
I was running and I tripped and fell over.
You fall down the stairs:
I slipped and fell down the stairs and broke my leg.
You fall off something you are standing on or riding:
she fell off a motorbike and was lucky to survive