something or someone that is easy to attack or criticize.

Unarmed policemen walking the streets late at night are sitting ducks.

• 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
• down on something
• down on your luck
• down the drain
• Down the hatch!
• down the line
• down the pike
• down the road
• down the toilet