one after another

• one after the other

Dates back at least to Old English ān æfter ōþrum, of the same meaning.

• Audio (General Australian):

  (file)

one after another (not comparable)

2. (idiomatic) In single file.
4. (idiomatic) Individually, in a particular sequence or chronology.
6. (idiomatic) Unrelentingly.

   Once discipline broke down, problems came one after another.

• (in single file): one by one
• (individually, in sequence or chronology): one at a time

• (unrelentingly): one thing after another, if it's not one thing it's another

• one another