"hunger had caused the hollows in their cheeks"
"he built himself a cabin in a hollow high up in the Appalachians"
"a hollow wall" "a hollow tree" "hollow cheeks" "his face became gaunter and more hollow with each year"
"the hollow sound of footsteps in the empty ballroom"
"empty promises" "a hollow victory" "vacuous comments"
"the mining company wants to excavate the hillside"
"hollow out a tree trunk"