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The Japanese word

見る見る

is pronounced
mirumiru | みるみる
means
very fast, in a twinkle
Examples:
水は見る見るうちに橋げたのところまで達した。
mizu wa miru miru uchi ni hashigeta no tokoro made tasshi ta.
The water came up to the bridge girder in a second.
Examples sourced from tatoeba.org