When you fight, you have four level of distance and defence:
The short range is where wrestling begins. As a Karateka your goal should be to stick to Kickboxing and get out as soon as you hit, not to get face to face with the opponent. However when you are forced to clinch and to wrestle, you should know how to defend in the short range.
Clinching techniques comprehend elbows (Hiji/Empi Waza - 肘技)…:
…knees (Hiza-Waza - 膝技)…:
…and headbutts (Atemi/Zuzuki-Waza - 頭打技):
Such strikes are not usually present in Kumite (except knees in Kyokushinkai), but they are actually my favourite strikes to use because of their great pain-to-damage ratio (throwing these techniques require usually minimal conditioning when used correctly, and they inflict loads of damage).
However, besides “hard” striking techniques, Karate comprehends also “soft” throwing techniques, that become useful in wrestling. Such soft techniques are “stolen” from Judo and from Japanese Ju Jutsu, meaning that they were codified by these styles before (modern) Karate did.
While the execution is basically identical to Judo, it has a different philosophy: in Judo, the throw is the definitive technique, in Karate, it’s a setup for an hard technique or a lock (see Grappling). Also, in Karate is auspicable not to go to the ground intentionally, so sacrifice throws are not practiced.
Here is a list of Karate throws (Nage-Waza - 投げ技)…:
Finally, I would like to illustrate grabs (Dori-Waza - 取技). It’s often found in Kata punches the pulling hand (Hikite - 引き手). Some misunderstand it as an old way to generate power that has been disproven in the modern day. However, as the names state, it mimics pulling your opponent gi to make it come into the strike. An hikite can be performed with many grabs, listed here:
NOTE:
Other wrestling and clinching technqiues in Karate include rarely mentioned biting techniques (Kame-Waza, 噛み技) and shoulder striking techniques (Kata-Waza, 肩技).