Hiji uke is written in Japanese in the following manner: 肘受け
Hiji uke contains two Kanji 肘受 and a suffix け.
肘 = Hiji = elbow (enpi is a nickname used for the strike)
受 = Uke = receive (block is the common translation, but not very accurate)
As with any technique, there is a basic form and there are ways to use the basic movement, transforming it to suit circumstance and purpose. For Hiji uke, the basic movement can be found in Pinan Sandan and Chinto, where it is practiced in a large movement. The kamae that precedes Hiji uke is considered a preparation for the movement that follows. The Kata pictures below are a demonstration of Hiji uke from Pinan Sandan and Chinto. Note that some instructors do not open the elbow for Chinto.
In Pinan Sandan, Hiji uke is trained in a large movement. The step (Ayumi ashi) helps to master the timing.
The movement in Chinto is more difficult than Hiji uke from Pinan Sandan, because the movement is shorter and more direct.
In both Kata, the emphasis is placed on rotation of the central axis (Seichujiku). The video and the photo series below show how you can use Hiji uke in combination with Seichujiku for close range.
A practical example is working from a neutral position as shown below. In this case you work with central axis in combination with your arms hanging relaxed by the sides of the body for protection. The relaxed arm can be used to parry or deflect an attack such as a punch or grabbing action with the body. After Hiji uke, you can use the rotational movement of the body to execute shuto uchi to the floating ribs. Control Ukemi at the same time with your right hand and make sure follow up and use both hands in harmony accordingly as you continue with chudanzuki. The working together of the hands is called Meotode.