catch (someone) off guard

to surprise someone.

He's used to being interviewed and it seems that no question catches him off guard.

• a rap sheet
• a rat fink
• a rat race
• a raw deal
• a ray of sunshine
• are all over
• a red cent
• a red eye
• a red herring
• a red-letter day
• a reign of terror
• a Renaissance man
• a rent boy
• are someone all over
• are something all over
• a revolving door
• Are you a man or a mouse?
• argue the toss
• argy-bargy
• a rich seam
• a ringside seat
• a ringside view
• a rip-off
• a ripple effect
• a rite of passage