The phrase "large chunk" means a significant or substantial portion, amount or piece. It can refer to something that is considerable in size, quantity or extent. For example, if someone says they need to complete a large project at work, it would mean there's a big task ahead of them and they have their hands full with the job. Similarly, if one talks about receiving a large chunk of money as an inheritance, it means they are getting a substantial amount that can make a difference in their lives. In summary, "large chunk" implies something significant or sizable in size, quantity or extent.