I solemnly swear I am up to no good

Phrase that allows a person to see what is on the Marauder's Map. Told to Harry Potter by Fred and George Weasley

"When you want to open the map, say I solemnly swear I am up to no good; to close it, say mischief managed.

95👍 14👎

I solemnly swear I am up to no good

Mischief managed

“I solemnly swear I am up to no good”

12👍 2👎

Swear Up

To sarcastically suggest that you are speaking the truth, although you and probably the other people know that you are lying.

Dave: Steve bruv, did you see that Man just jump 50 ft in to the air?
Steve: Nah!! Actually?
Dave: Yeah bruv, swear up.