to spoil something by trying to improve or decorate it when it is already perfect.

Should I add a scarf to this jacket or would it be gilding the lily?

• the long arm of the law
• the love of life
• the love of your life
• the lowest common denominator
• the lowest of the low
• the low man on the totem pole
• the luck of the draw
• the lull before the storm
• the main drag
• them and us
• the man in the street
• the man of dreams
• the man of the moment
• the man of your dreams
• the man on the Clapham omnibus
• the man on the street
• the matter in hand
• the meat and potatoes
• the men in grey suits
• the men in white coats
• the Midas touch
• the middle ground
• the milk of human kindness
• the mind boggles
• the mind boggles.