a long curved fruit that grows in clusters and has soft pulpy flesh and yellow skin when ripe

a bunch of bananas

the tropical and subtropical palmlike plant that bears bananas, having very large leaves but lacking a woody trunk

extremely angry or excited

she went bananas when I said I was going to leave the job

lacking reason or common sense; very foolish or irrational

I've spent two months in a studio—I must be bananas

Roy's customers think the council has gone bananas