if a subject is no laughing matter, it is serious and not something that people should make jokes about.

Haemorrhoids are all very funny when other people have them, but if you get them yourself, it's no laughing matter.

• used to doing something
• used to do something
• used to something
• Use loaf.
• use something to good account
• use to good account
• use up
• use up something
• Use your loaf.
• usher in
• usher in something
• usher someone in
• vanish into thin air
• vanish off the face of the earth
• Variety is the spice of life.
• vent spleen
• vent your spleen
• verbal diarrhoea
• very much so
• very well
• vicious circle
• villain of the piece
• voice in the wilderness
• volte-face
• vote with feet