To Blink, To Flicker, To Twinkle
transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means blink and the verb vocab version is to blink. This word is generally used in the phrase 瞬く間に (in the blink of an eye).
またたく
Mah ta-ta (またた) is showing, causing you to blink. I don't know what a "ta-ta" is, but I bet you could come up with something that's blink-worthy.
辺りの景色は瞬く間に雪に覆われ、真っ白になった。
The landscape was covered by snow in a flash and everything turned white.