what is shotei?
Sho means palm of the hand and Tei translates into bottom or base.
It can be use for attack as well as defense. Shotei is reffered to as Shotei Uke or Shotei Uchi - depending on how it is used.
When doing Shotei, bend at the wrist forcefully and fold the fingers to use the palm of the hand.
This is the formal version of Shotei...
...The main thing is bending the wrist so that you can use the palm of the hand to strike.
By the way: Shotei is also called Teisho - simply reversing the Kanji. I was used to Teisho until Sakagami sensei corrected me. At this time, I find Shotei to be more accurate as Tei usually comes last.
A Nunchaku for example.
The bottom is called KonTEI. It seems more reasonable to me that it should be Shotei, structure wise.
shotei basics and application
Shotei uke (doing a defense using the palm of the hand) does not really have a specific movement that characterises itself. It can be found in several kata though. Niseishi, Jitte and Wanshu are examples. Shotei Uke is frequently used as Otoshi Uke, Osae Uke and Yoko Harai Uke. All depends on circumstance.
applications of Shotei uke
beginner level ippon kumite
This Kumite is actually in Wado No Michi as a Kaisetsu for Niseishi. Note that we show it on purpose with the opponent suffering Itsuki in the front leg. Not because he attacks in the wrong manner, but because it is supposed to display the result of a proper Shotei Yoko Harai Uke.
advanced level ippon kumite
Here's another Kumite that uses Shotei for defense as well as attack. Having said that, the first movement uses typical Wado Taisabaki and executes Shotei as Tsuki - just behind the elbow.