have an ace up (your) sleeve

to have an advantage that other people do not know about.

The new game show has an ace up its sleeve. It will allow viewers to play from home and win prizes.

• see something for what they really are
• see something through
• see stars
• see the back of
• see the back of someone
• see the back of something
• see the colour of money
• see the colour of someone's money
• see the error of its ways
• see the error of ways
• see the error of your ways
• see the glass as half empty
• see the glass as half full
• see the glass half empty
• see the glass half full
• see the light
• see the light of day
• see the sights
• see the writing on the wall
• see things
• see through
• see through someone
• see through something
• see to
• see to something