tightenvt.使紧；勒紧；固定vi.变紧tightening cushion预紧垫片tighten one's belt束紧腰带tighten the screwsvi.拧紧螺丝(加强控制)tighten their beltvi.勒紧腰带(忍饥受寒；节衣缩食；减少开支)tighten up security使安全措施更严密.tighten the economy紧缩经济tighten the noose on加紧对 ... 的控制tightening indicator张紧指示器tighten the bonds of加强 ... 联系tightening of credit紧缩信贷