One After Another
Successively, In Succession
adverb, noun
When you continue and then you continue again (that's the repeater kanji), you get things happening one after another. Continue continue continue!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
オフィスの出口から社員が続々と出てきた。
Employees came out of the office exit, one after another.
ワニカニのサブスクリプションを申し込みたいという人が続々と集まってきて、うれしいけどちょっと困っています。
There are a lot of people subscribing to WaniKani, one after another, and we're happy about it, but we're having some issues with it as well.
ワニカニに新しい単語が続々と登場する日が待ち遠しい。
I can’t wait for the day when new words pop up one after another on WaniKani.