distend (something) to swell (= become larger and rounder than before) or make something swell because of pressure from inside (Oxford)
2. (usually of the stomach or another part of the body) to swell and become large, especially because of pressure from inside (Cambridge)
He tied a piece of cloth around his upper arm to impede circulation and distend the veins. (Oxford)
During digestion, sugar may produce wind that distends the stomach. (Cambridge)
distend the veins
wind that distends the stomach
Amplify
Bloat
Compress
Contract
Distended