vt.

1. 沾污，污染[（+with）]
   Blood stained the blanket.

   血沾污了毯子。

2. 玷污，败坏
   His crimes stained the family honor.

   他的罪行玷污了家庭的名誉。

3. 给（木材，玻璃等）染色，给……着色
   She stained the table brown.

   她将桌子涂成了棕色。

4. 把（标本等）染色以便于显微镜下观察

vi.

1. 变脏；被沾污
   His character is without stain.

   他的人品纯洁无瑕。

   These carpets won't stain easily.

   这些地毯不易弄脏。

n.

1. 污点，污迹，瑕疵[C]
   He's got an ink stain on his shirt.

   他衬衫上有块墨渍。

2. 色斑[C]
3. 着色剂，染色剂[C][U]

v.

1. mark or discolour with something that is not easily removed.
2. damage (someone's or something's reputation).
3. colour with a penetrative dye or chemical.

n.

1. a stubborn discoloured patch or dirty mark.
2. a thing that damages a reputation.
3. a dye or chemical used to colour materials.
   ▸Biology  a dye used to colour organic tissue so as to make the structure visible for microscopic examination.
4. Heraldry  any of the minor colours used in blazoning and liveries.