/ˈdef.ə.sɪt/
A deficit is the amount by which something is less than what is required or expected, especially the amount by which the total money received is less than the total money spent. 亏损; 赤字
chiefly US : a problem that causes a decrease in some ability（人体的）缺陷
She has a slight hearing deficit in her left ear.
她的左耳有轻度的听力缺陷。