Hi; An hourglass is a timepiece that uses the flow of sand through a small ******* to measure out an hour (60 minutes) of time. If she can stay underwater for the entire length of time that an hourglass measures, then she is a fish. Even whales and dolphins cannot hold their breath that long.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.