The phrase "big lump" is used to describe a person or thing that is large and heavy. It can also be used to refer to someone who is clumsy or not very graceful. Full definition
By aggressively contributing now, you'll have a nice big lump of cash in that 401 (k) to invest with in the future. (biggerpockets.com)
I like how you handle your mortgage, putting in more money when it's available or in big lump sums. (yourpfpro.com)
No matter how big the lump in your throat when you first see that positive test result, be prepared for an even bigger one when you meet your little one on screen! (momtricks.com)