stagnate /ˈstæɡneit/ vt. & vi. (使)停滞不前，(使)不流动；(使)变为污浊：stagnate waters使水不流动The water stagnates in the ditch. 水在沟中停滞而变浊。Teaching can easily stagnate into a set of routines.教育很容易固化为变一套陈规。