Late breakfast, early lunch or a combination of both.
Although brunch is now a familiar word, the name of this late breakfast, invented in the 1890s by combining the beginning of breakfast with the end of lunch, must have sounded as strange to the late Victorians as lupper, proposed in the 1970s as a name for a meal between lunch and supper, now sounds to us. The reason lupper has not caught on is that since the 1970s people have been eating their supper later in the day, not earlier, and so lupper has no reason to exist. A far more useful portmanteau word is slake, the name of a snack eaten in the middle of the night; invented about two minutes ago by combining sleep and wake, this new word will eventually become so popular that it will even spawn verb forms such as slaked and slaking.
A commonly used phrase to refer to a midday repast that melds the cuisine of morning and afternoon dining, comprising of dishes that could aptly grace either of these meal times, and typically served within the timeframe of 10 o’clock in the morning and 1 o’clock in the afternoon.