a liquid used for printing or writing or drawing
"She dipped her pen into the fresh ink to sign the important contract."
dark protective fluid ejected into the water by cuttlefish and other cephalopods
"When I saw a cloud of black ink suddenly appear in the shallow bay, it was clear that a cuttlefish had just sprayed its defensive secretion to escape."
A pigment (or dye)-based fluid used for writing, printing etc.
"I spilled a drop of black ink on my white shirt while I was signing the contract at the printer."
In plain English: Ink is the dark liquid that pens and markers use to make marks on paper.
"I need to buy more blue ink for my fountain pen."
Usage: Ink is the liquid substance you put inside pens or printers to make marks on paper. Use it as a singular mass noun when referring to the material itself, such as "running out of ink."
To apply ink to; to cover or smear with ink.
"The editor had to rewrite the entire article because someone accidentally smudged black ink across half of the printed page."
In plain English: To ink means to put ink on something, usually by stamping or printing it.
"He decided to ink the contract before leaving for the meeting."
Usage: Use "ink" as a verb when describing the physical act of covering a surface with liquid ink, such as smearing it on paper or fabric. It is often used in printing contexts where type is set with ink before being pressed onto a page.
The word "ink" comes from the Latin encaustum, which originally referred to a purple ink used by Roman emperors for signing documents. This term entered Middle English via Old French and eventually replaced the native Old English word blæc.