Compress/kəmˈpres/ Definition 1 of 3Pro Tip 1/3Physical Force Emphasizes the use of physical strength or mechanical power to reduce size. He compressed the cardboard box to fit it into the bin. Pro Tip 2/3Space Saving Often used when packing or storing items tightly to conserve space. She compressed her quilts in vacuum bags for storage. Pro Tip 3/3Implies Effort The action usually requires effort or energy to push things together. They compressed the garbage to make more room in the dumpster.