tighten [ˈtʌɪt(ə)n]
vt.使变紧缝紧收紧使更严格
vi.变紧绷紧变得更严格
英译：make tight or tighter
例句：they tightened their grip on the land
他们加紧了对这片土地的控制
collapse
美[kəˈlæps] 英[kəˈlaps]
vi. 倒塌晕倒支撑不住累得倒下垮掉倒闭破裂失败破灭垮台暴跌萎陷瘪掉折叠起来
vt. 折叠合并
n. 倒塌病倒晕倒崩溃倒闭破裂失败破灭垮台暴跌萎陷瘪掉
英译：
1 .an abrupt failure of function or complete physical exhaustion
2. a natural event caused by something suddenly falling down or caving in
the roof is in danger of collapse
the collapse of the old star under its own gravity
3. the act of throwing yourself down
4. a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
例句：he collapsed from loss of blood
他因失血而虚脱
