|my/his/her etc. lips are sealed||promise not to discuss/reveal information||I won’t tell anyone. My lips are sealed|
|on everyone’s lips||talked about by a lot of people||News of a royal engagement was on everyone’s lips.|
|stiff upper lip||ability to not show negative emotions for example anger, fear, pain or disappointment (a character often associated with British people)||Although it hurt when Harry broke his arm, he kept a stiff upper lip and did not cry.|
|on the tip of one’s tongue||when you are unable to remember a word or name although you know it||What’s his name again? It’s on the tip of my tongue.|
|cat got your tongue?||unable to speak because of embarrassment or shyness||
Woman: Hello little Esther.
|set tongues wagging||cause people to gossip or spread rumours||Photographs of the Prince in a jeweller’s shop set tongues across the country wagging.|
|tongue-in-cheek||an insincere, joking or ironic comment/a comment which is not meant to be taken seriously||I’m sorry if I offended you. My comments were tongue-in-cheek, I never thought you would take them seriously.|