[Idioms and meanings] All of a sudden; All or nothing

All of a sudden

1. Suddenly.

• All of a sudden, lightning struck the tree we were sitting under. 
• I felt a sharp pain in my side all of a sudden.

 All or nothing

1. Everything or nothing at all.
2. Time to choose to do something or not to do it.

• Sally would not accept only part of money. She wanted all or nothing.
• It was all nothing. Tim had to jump off the truck or risk drowning when the truck went into the water.

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