From Longman Dictionary of Contemporary Englishsaw something ↔ up phrasal verbCUTto cut something into many pieces, using a saw The tree was cut down and sawn up for logs. → saw→ See Verb table
Examples from the Corpus
saw up• My grandmother used to live in back of the highway and saw her tied up.• Young Jinny here reckons she saw it heading up here yesterday.• I saw a boy up in one of the trees.• Some one saw me running up that right-hand staircase, running for the train.• She saw you coming up the drive, and hit on the ideal way to take her revenge.• Neighbours raised the alarm when they saw flames light up the early-hours darkness in Ferry Road, Edinburgh.• He turned quickly and saw it coming up the slope behind him.• The only other sighting we've had was a farm worker who thought he saw the car up towards Cumbermound about nine. 