n.

1. 墨水；油墨；墨汁[U]
   The book was worn out and had ink stains on its cover.

   这本书破旧了，封面上有墨渍。

vt.

1. 用墨水写；涂墨水（或油墨）于
   He inked his pen.

   他把笔蘸上墨水。

2. 用墨水（或油墨）沾污
3. 【美】【俚】签署；签订（合同等）

n.

1. a coloured fluid used for writing, drawing, or printing.
2. Zoology  a black liquid ejected by a cuttlefish, octopus, or squid to confuse a predator.

v.

1. write or mark with ink.
   ▸cover (type or a stamp) with ink before printing.
2. N. Amer. informal sign and secure (a contract).