one by one

Idioms  

1. Also, one at a time. Individually in succession, as in The ducklings jumped into the pond one by one, or One at a time they went into the office. Formerly also put as one and one and one after one, this idiom dates from about a.d. 1000.

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Example Sentences

"It will take time to reply to them all but I'll start doing them one by one after this."

From Barron's

“While most people were trying to dodge the downpour—TV screens giving up one by one, umbrellas suddenly becoming the hottest commodity in the room—we at InPlanet were secretly thrilled,” he said.

From The Wall Street Journal

"Baby Shark", in which a shark family is introduced one by one to a chirpy tune, is a global megahit and has featured as a Macy's parade balloon in New York.

From Barron's

"Battlefield" challenges its rival with smaller multiplayer maps than usual and a "battle royale" mode where players eliminate each other one by one, similar to a popular mode found on "Call of Duty".

From Barron's

As we entered Delhi from the neighbouring suburb of Noida, we could see a long queue of vehicles at the border as policemen searched them one by one.

From BBC