v. phr. 1. To use until nothing is left; spend or consume completely. Don't use up all the soap. Leave me some to wash with. Jack used up his last dollar to see the movies.
Compare: GIVE OUT 5 . 2. informal To tire completely; make very tired; exhaust; leave no strength or force in. Usually used in the passive. After rowing the boat across the lake, Robert was used up.
Compare: GIVE OUT 4 , WEAR OUT.