double check (noun)

1. In a hilarious twist, the double check of the answer revealed that the math teacher had made a mistake in simple addition.

2. He wanted to make sure that everything was perfect for their candlelit dinner, so he did a double check on the reservation at the fancy restaurant.

3. Before stepping out onto the runway, the model did a final double check of her outfit, making sure every accessory was in place.

4. The detective character in the anime series always does a double check of any clue he finds to ensure its accuracy.