How to say "any moment now, about to" in Russian?

Вот-вот

"any moment now, about to" is Вот-вот in Russian.

Вот-вот means "any moment now, about to" in English.

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Word #781 of 4,000 by frequency in Russian — level A2.

Example

Дождь вот-вот начнётся, возьми зонт с собой.

The rain is about to start, take an umbrella with you.