名詞 ink:

1. a liquid used for printing or writing or drawing
2. dark protective fluid ejected into the water by cuttlefish and other cephalopods

動詞 ink:

1. append one's signature to
2. fill with ink

1. There's an ink stain on your shirt.
   你的襯衫上有一個墨水斑。
2. Complete your application in ink.
   用鋼筆填申請表。
3. One dab with blotting-paper and the ink was dry.
   用吸墨紙輕輕按了一下，墨水就乾了。
4. These ink stains won't wash out.
   這些墨跡洗不掉。
5. He swore at the boy who dropped ink on the book.
   他對那把墨水倒翻在書上的孩子臭罵了一頓。
6. He has run out of red ink.
   他的紅墨水用完了。
7. The little boy stained his fingers with ink.
   小男孩的手指讓墨水給染臟了。
8. The printing ink has been used up.
   印刷油墨用光了。

ink

n.（名詞）
A pigmented liquid or paste used especially for writing or printing.
墨：一種用于書寫和印刷的有色液體或糊狀物
A dark liquid ejected for protection by most cephalopods, including the octopus and squid.
（烏賊等的）墨汁：大多數(shù)頭足動物（包括章魚和烏賊）用于保護自己而噴出的黑色液體
v.tr.（及物動詞）
inked,ink.ing,inks
To mark, coat, or stain with ink.
涂墨水，以墨水做記號：用墨標記、覆蓋或弄臟
Informal To append one`s signature to (a contract, for example).
【非正式用語】 附加簽名：附上自己的簽名（如在一份合同上）

來源：
Middle English inke
中古英語 inke
from Old French enque
源自 古法語 enque
from Late Latin encaustum [purple ink]
源自 后期拉丁語 encaustum [紫墨水]
from Greek enkauston [painted in encaustic]
源自 希臘語 enkauston [彩色燒制品上畫的]
from enkaiein [to paint in encaustic, burn in] * see encaustic
源自 enkaiein [在彩色燒制品上畫，燃燒] *參見 encaustic

【引伸】
ink.er
n.（名詞）
ink.iness
n.（名詞）
ink.y
adj.（形容詞）