In a pitcher stir together lime juice, sugar, and water until sugar is dissolved.
Add 1/3 cup cherry syrup, taste, and add more syrup if desired. Chill 1 hour before serving OR serve with ice cubes immediately.
Notes
Pro tip: Use the limeade to make ice cubes, then serve with cherry limeade ice cubes instead of regular water ice cubes to keep from watering your juice down as the ice melts.