noun

• The rubbing of one object or surface against another.
• (physics) A force that resists the relative motion or tendency to such motion of two bodies in contact.
• (medicine, obsolete, countable) Massage of the body to restore circulation.
• (figuratively) Conflict, as between persons having dissimilar ideas or interests; clash.
• (China, historical) (Second Sino-Japanese War) Conflict, as between the Communists and non-Hanjian Kuomintang forces.