double fault

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

• noun Two successive service faults in tennis, resulting in the loss of a point.

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

• noun tennis The missing of both the first serve and second serve, resulting in a point for the receiver.
• noun computing An exception thrown by the CPU while trying to call the handler of another exception (e.g. the exception handler is invalid or the call stack has overflown).

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

• noun (tennis) two successive faults in serving resulting in the loss of the point