1.

1. The water stagnates in the ditch.
    水在沟中停滞而变浊。

1. stagnate

1. 淤塞：stagnantly 淤积地 | stagnate 淤塞 | stagnation 停滞

2. 使淤积：439.excrement 排泄物 大便 | 440.stagnate 使淤积 | 441.culture 培养 培育

3. 停滞不前：cute 可爱的,聪明的 | stagnate 停滞不前 | trainer 师傅

1. 停滞不前;不发展;无变化
    If something such as a business or society stagnates, it stops changing or progressing.

    e.g. Industrial production is stagnating...
           工业生产正停滞不前。
    e.g. His career had stagnated.
           他的事业已经陷入停滞。

1. be idle
    exist in a changeless situation

    e.g. The old man sat and stagnated on his porch
           He slugged in bed all morning

    Synonym: idlelazeslug

2. cease to flow
    stand without moving

    e.g. Stagnating waters
           blood stagnates in the capillaries

3. cause to stagnate

    e.g. There are marshes that stagnate the waters

4. stand still

    e.g. Industry will stagnate if we do not stimulate our economy