ILL noun 1forms 1phrases 7 noun1 •Initialism of interlibrary loan. formsILLs Phrases with ILL be taken illTo become ill. bird of ill omenA person who brings bad news. do illTo harm, to injure. house of ill fameA brothel ill healthA state of illness, or bad health. lie ill in one's mouthTo sound artificial or contradictory. take illTo become ill, to fall ill.
