roller skate
Longman Dictionary of Contemporary English 5++LDOCE 5++ˈroller skate noun [countable] 
DLa special boot with four wheels fixed under it, used for skating on hard surfaces 四轮旱冰鞋；滚轴溜冰鞋 → Rollerblade, in-line skate →5 see picture at 见图 skate1 —roller-skate verb [intransitive] —roller skating noun [uncountable]
DLa special boot with four wheels fixed under it, used for skating on hard surfaces 四轮旱冰鞋；滚轴溜冰鞋 → Rollerblade, in-line skate →5 see picture at 见图 skate1 —roller-skate verb [intransitive] —roller skating noun [uncountable]Examples from the Corpus
roller skate• All we do is dance and roller skate.ˈroller skate nounChineseSyllable
a under wheels special it, with Corpus four for fixed used boot
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roller skate
ˈroller skate
noun [countable]
a special boot with four wheels fixed under it, used for skating on hard surfaces ⇨ Rollerblade, in-line skate
—roller-skate verb [intransitive]
—roller skating noun [uncountable]
ˈroller skate
noun [countable]a special boot with four wheels fixed under it, used for skating on hard surfaces ⇨ Rollerblade, in-line skate
—roller-skate verb [intransitive]
—roller skating noun [uncountable]