1 This helps keep your upper back straight while having a slight arch in your lower back. 2  Slowly lift by straightening your hips and knees (not your back). Keep your back straight, and don't twist as you lift.  Hold the load as close to your body as possible, at the level of your belly button.
Definition of birthday. 1  1a : the day of a person's birthb : a day of origin. 2  2 : an anniversary of a birth her 21st birthday.
A birthday party is a celebration. The definition of a celebration is an act or event designed to commemorate something or make something special and enjoyable. An example of a celebration is a party you have for someone's birthday. celebration. celebration.