Yako
Vulnerable striking point on the upper thigh

yakusoku kumite
Pre-determined fighting between two opponents

Yama Gamae
Mountain posture

Yama tsuki
U Punch

Yame
Stop

Yoi
Ready or a position indicating your readiness

Yoi-dachi
Ready stance, a position of readiness

yoi no kisin
Prior to kumite or kata, you mentally prepare yourself for what is about to happen. This is a preparation of the state of readiness

Yoko
To the side

Yoko Empi Uchi
Elbow strike that travels outward to the side of the body

Yoko Gake
Side hook, or this can also apply to side body drop

Yoko Geri
Kick that travels to the side of the body like yoko geri kekomi (thrust) or keage (snap)

Yoko mawashi empi uchi
Side round elbow strike

Yoko mawashi uchi
Horizontal strike

Yoko tobi geri
jumping, or flying side kick

Yoko tsuki, uchi, uke
Side punch, strike, block

Yondan
Fourth or 4th dan black belt

Yon ju
forty

Yori ashi
Sliding step, this is used to get closer to your opponent without stepping

Yubi
Finger

Yudansha
Black belt holder, any grade