Definitions

1. verb

to fill something to a level that is below the maximum capacity

“The manufacturing process involved underfilling the container to save materials.”

2. noun

a situation where something is filled to a level below the maximum capacity

“The underfill in the storage tank resulted in wasted space and reduced efficiency.”

3. noun

the amount by which something is underfilled

“The underfill in the packaging process was 5% of the total volume.”