a conflict of opposed ideas or attitudes or goals; "a collision of interests"
an accident resulting from violent impact of a moving object; "three passengers were killed in the collision"; "the collision of the two ships resulted in a serious oil spill"
(physics) an brief event in which two or more bodies come together; "the collision of the particles resulted in an exchange of energy and a change of direction"
hostile to or disruptive of normal standards of social behavior; "criminal behavior or conduct that violates the rights of other individuals is antisocial"; "crimes...and other asocial behavior"; "an antisocial deed"
shunning contact with others; "standoffish and antisocial"; "he's not antisocial; just shy"