2. To prevent something from being discarded, rejected, or put out of operation.
3. Etymology: from the stem of Old French rescourre, "to shake loose"; from re-, intensive prefix, + escourre, "to cast off, to discharge"; from Latin escutere, excutere, "to shake off, to drive away"; from ex-, "out" + -cutere, a combining form of quatere, "to shake".
Threats to archaeological remains occur in the form of road-building, road improvement, new building of houses, offices, and industrial complexes, the flooding of valleys for reservoirs, and improved farming techniques involving the use of deep plowing.
The rescue, or salvage, archaeologist, is concerned with the retrieval of as much information as possible about the archaeological sites before they are damaged or destroyed. Frequently time is too short and funds are too limited for anything but a brief survey.