A tavern clock is like a clock that you might see hanging on the wall of a restaurant or bar. It tells you what time it is so you can keep track of your day. But a tavern clock is special because it is often larger than a regular clock and has a big bell or chime that rings out to let everyone know what time it is.
In the olden days, not everyone had a watch or a clock in their house, so they relied on big public clocks like the tavern clock to help them keep track of time. Tavern clocks were often located in the center of a town or village, so everyone could see it and hear it. They were very important because they helped people know when it was time to open their shops or go to work or go to bed.
Today, tavern clocks aren't as common as they used to be because most people have clocks on their phones or computers. But some places still have tavern clocks as a way to remember a time when people relied on them to keep track of their days.