ink
noun(ink)
a liquid used for printing or writing or drawing
ink
verb(ink)
append one's signature to
Examples:
They inked the contract. 
ink
noun(ink)
dark protective fluid ejected into the water by cuttlefish and other cephalopods
ink
verb(ink)
fill with ink
Examples:
Ink a pen. 
ink
verb(ink)
mark, coat, cover, or stain with ink
Examples:
He inked his finger.