pressure point

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several points on the body at which an underlying artery can be pressed against a bone to stop distal bleeding.
• noun An area on the skin that is highly sensitive to the application of pressure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun martial arts A specific small area of the body targeted, due to a cluster of nerves being close to the skin, usually not protected by bone.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun where problems or difficulties are likely to occur
• noun an area on the skin that is highly sensitive to pressure
• noun any of several points on the body where the pulse can be felt and where pressure on an underlying artery will control bleeding from that artery at a more distal point