something up sleeve
(something) up (your) sleeve
something secret you can use.
If this plan doesn't work out I've still got a few ideas up my sleeve.

Usage notes: ften used in the forms the card up your sleeve or the ace up your sleeve - a secret advantage you can use:
That recommendation from my teacher was the ace up my sleeve.

[TahlilGaran] English Idioms Dictionary ▲

up sleeve
(something) up (your) sleeve
something secret you can use.
If this plan doesn't work out I've still got a few ideas up my sleeve.

Usage notes: ften used in the forms the card up your sleeve or the ace up your sleeve - a secret advantage you can use:
That recommendation from my teacher was the ace up my sleeve.

[TahlilGaran] English Idioms Dictionary ▲

up one's sleeve
kept secretly ready for the right time or for a time when needed
He probably has something up his sleeve and will be able to find a job when he needs one.

[TahlilGaran] English Idioms Dictionary ▲

up one's sleeve
adv. phr.
1. Hidden in the sleeve of one's shirt or coat and ready for secret or wrongful use.
The crooked gambler hid aces up his sleeve during the card game so that he would win.
2. informal Kept secretly ready for the right time or for a time when needed.
Jimmy knew that his father had some trick up his sleeve because he was smiling to himself during the checker game.
Compare: CARD UP ONE'S SLEEVE.
3. See: LAUGH UP ONE'S SLEEVE.

[TahlilGaran] English Idioms Dictionary ▲