D is for...
"Diffindo!"
As his robes tore down the seam, Ron thought about how lucky he was to get off this easily. He could very well have been hit with that spell that took off George's ear; Ginny didn't seem to know that one though, so Diffindo it was. He thought he'd better remove himself from the scene for a few days however, just to be on the safe side.
"Defodio!"
Digging in the beach was so much easier when they were allowed to use magic. Harry and Ginny brought their kids down to Brighton with Teddy every summer without fail, where they would have digging competitions. Somehow, Harry always ended up winning. Teddy strongly suspected his godfather cheated, and resolved to pay him back in kind.
"Densaugeo!"
Working against criminals was risky, but luckily Harry had a couple of tricks up his sleeve. He cast the hex at the taller of the two, and the woman stopped throwing curses at him as her teeth fell past her collar. Unfortunately, he didn't know how to reverse it and her partner got away in the confusion, slipping off into the back streets as she failed around.
"Deletrius!"
Percy deleted the handwriting off the parchment as Fred and George bounded past him, working their way to the Portrait Hole. Penelope sent him mail every day at breakfast, but it was necessary to remove all traces of contact before the twins found out about them. He would rather die than have them tease him about being in love.
"Deprimo!"
The ice cracked around Victoire's feet and she quickly scooped up her cousin, running towards the castle as the remainder of their family stood in shock. The children had been skating on the lake, when Albus had landed on a thin patch in the ice, falling into the water and becoming disoriented under the ice. Victoire's quick thinking saved him, but he never skated again.
"Descendo!"
The elevator swiftly went down three storeys, and the Potter-Weasley children giggled. Having not been to Hogwarts yet, they couldn't use that particular spell, but they had heard it used often enough that they thought it amusing. It was Dominique's idea to pretend to use it in the lift, but Victoire had been against it at first. Her face made it clear afterwards that she'd changed her mind.
"Duro!"
The tree turned hard as stone, and Hermione smirked. Despite being involved in numerous wizarding campaigns, she still took time to pay attention to Muggle events. One that was particularly close to her heart was the ancient forests, and knowledge that one was to be bulldozed for building space made her feel nauseous. She couldn't wait to see their faces when they found they couldn't move the trees at all.
"Dissendium!"
James swiftly glanced at the Map again as he swung his legs into the Hump-backed Witch's statue. Professors McGonagall and Flitwick were in their offices, so he, Fred and Louis were free to roam Hogsmeade after-hours again. Little did they know that Albus had the Invisibility Cloak on behind them, along with Rose and Scorpius; they had an uncanny knack for knowing exactly which exit to follow the elder trio to. James never found out.