[Supperman]

hang on
Meaning; Endure or persevere
Origin; Using one's hands to control something
Example; If you could hang on for one more week, I think we can have it finished by Friday.

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In the movie Batman(1989).
When Joker attacks the museum, Batman holds Bickey Vale's body (Kim Basinger) and they escape from the museum by using a Batman's rope-way like equipment.
Batman says to Bickey, just one word; "Hold on!"
If I remembered it correctly.

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If I hang on to continue this thread, I would become a Master of English!

We should hold on the nuclear power plant disaster, for our bright future.

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I ask a question; Is it possible to use "hang on" in negative form? As in;

Joker couldn't hold on the rope, and fell down into the acid bath.
Joker couldn't hold on the rope radder of the helicopter, and fell down to death.
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Naoto Kan hangs on his present post, and he won't resign.
It is quite a shame from the point of view of Bushido-spirits.
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If you could hang on studying for three more months, you will pass the entrance examination.