n. (c.)可數名詞酷似的人或物I thought I saw my double, but it was only myself in the mirror
adj.形容詞雙的A double room has a double bed for two people, a twin room has two beds
v.t./i.動詞 (及物/不及物)多工的This surface can double as a cutting board
adj.形容詞兩倍的 ; 雙重的 ; 加倍的I think we will double our sales this year, the market looks good
v.t./i.動詞 (及物/不及物)變成兩倍We can double the work if you help me
adj.形容詞雙倍的I’m so hungry I’ll have a double serving of spaghetti