to cause improvements or have a very good effect.

He's only been here for a couple of months and already he's worked wonders.

Drinking lots of water does wonders for the skin.

• double-dip
• double-dipping
• double Dutch
• double entendre
• double over
• double-talk
• double up
• double up with
• double up with someone
• double whammy
• doubting Thomas
• do us a favour
• do without
• do without someone
• do without something
• down-and-dirty
• down and out
• down-and-out
• down-at-heel
• down-home
• down in the dumps
• down memory lane
• down on
• down on luck
• down on someone