if something has to be seen to be believed, it is so surprising or shocking that it is difficult to believe.

The devastation had to be seen to be believed.

• get the message
• get the munchies
• get the nod
• get the picture
• get the push
• get the runaround
• get the sack
• get the shaft
• get the short end
• get the short end of the stick
• get the thumbs down
• get the thumbs up
• get the upper hand
• get the wind up
• get the wind up someone
• get the wrong end of the stick
• get through
• get through to
• get through to someone
• getting on
• getting on in years
• getting on toward
• getting there is half the fun
• get to first base
• get to grips with