rarefy (v.)

• adulterate
• aggrandize
• amplify
• attenuate
• augment
• baptize
• bloat
• broaden
• build
• bulk
• crescendo
• cut
• dematerialize
• develop
• dilate
• dilute
• disembody
• distend
• emaciate
• enervate
• enlarge
• etherealize
• expand
• extend
• hike
• huff
• increase
• inflate
• irrigate
• magnify
• puff
• pump
• raise
• reduce
• sap
• spiritualize
• stretch
• subtilize
• sufflate
• swell
• thin
• up
• water
• weaken
• widen