go off the reservation
Definition from Wiktionary, the free dictionary
From analogy with a member of the tribe leaving an Indian reservation.
- (literally) To leave a reservation to which one was restricted.
1872 April 10, United States Congress, The Congressional Globe, page 2332:
- The Indian may go off the reservation, he can steal from the whites and run back to the reservation with impunity.
- (US, politics) To break with one's party or group, usually temporarily.
1943, Paul De Kruif, Kaiser Wakes the Doctors, pages 79:
- This hand was ready to give the works to any physician, a member of the Medical Association in good standing, who'd go off the reservation by daring to serve a medical co-operative on a full-time salary.
1960 January 31, Harry S Truman, “Dear Joe”, in Monte M. Poen, editor, Strictly Personal and Confidential: The Letters Harry Truman Never Mailed, ISBN 0826212581, published 1999, pages 137:
- I'll never forget 1948 when these so called "liberals" (synthetics I call them) went off the reservation and gave New York to Dewey.
- (by extension) To engage in disruptive activity outside normal bounds.
1965, Drew Middleton, The Atlantic Community: A Study in Unity and Disunity, pages 186:
- When the Russians do go off the reservation, as they did early in April 1965, their object is not to challenge the Western allies of yesteryear, the United States, Britain, and France, but to impress upon West Germany their support for East Germany and its claim to West Berlin.