might-be adjective 1noun 1forms 1 adjective1 •That might be or occur; possible; potential; hypothetical."There is a might-be particle called a 'magnetic monopole' that was suggested by certain theories of Dirac and others but had never been observed. — 1998 noun1 •That which might be or happen; a possibility.It is a might be, a mere possibility from the tossing ocean of pure chance. — 1991 formsmight-bes