sag
[sæg] verb intransitive (-gg-)
■to drop down to a lower level in the middle （中间部位）下垂，下陷•The shelf sagged under the weight of the heavy books.书架被沉重的书压弯了。 •a sagging roof/floor/bed下陷的屋顶／地板／床 ■to become weaker 减弱；下降，下跌•The dollar held up well this morning but the pound sagged.今天上午美元走挺，但英镑下跌了。
[sæg] noun
[S or U]
■where something has dropped down to a lower level 下垂部分；下弯部分；下陷部分•a sag in the roof屋顶的下陷部分 countable usually singular
■a reduction in something 下降，下跌•a sag in sales销售量下降 |