
One by one
Repeated Actions
Use 'one by one' to emphasize each action is done in turn, typically in a deliberate or orderly manner.

She answered the questions one by one.
Building Suspense
'One by one' can add a sense of anticipation or suspense, as outcomes unfold gradually.

The lights in the old house went out one by one.
Not Simultaneous
Use 'one by one' when things are not happening all at the same time but in a sequence.

The students entered the classroom one by one.
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