What does mother-in-laws tongue mean?
• MOTHER-IN-LAW’S TONGUE (noun) The noun MOTHER-IN-LAW’S TONGUE has 2 senses: 1. stemless plant having narrow rigid leaves often cultivated as a houseplant 2. a evergreen plant with large showy dark green leaves; contains a poison that swells the tongue and throat hence the name Familiarity information: MOTHER-IN-LAW’S TONGUE used as a noun is rare.