To sign leave, hold up both palms in front of you with the ASL number 5 hands. Then move them down a bit, indicating you are leaving something right there.
Leave is signed just a bit like heavy, so be careful not to get the two confused. With 'leave', you don't stoop due to the imagined weight of the object. You just stand or sit up straight as you sign leave.
Teach your toddler the leave sign when you want them to leave their toys or set them aside because you have another activity, chore, or errand to attend to. You can also teach this sign so that your toddler can show you when he or she has forgotten and left something somewhere.
This is a useful flash card taught best in conjunction with the signs of your toddler's favorite objects: a toy, a teddy bear, or a coloring book. That way, if they leave and forget the item somewhere, they can let you know and you can help them find it.