1. To annoy or irritate
2. To plant a concealed microphone in
3. Bother, annoy
4. To lose one's composure; freak — often used with out

ETYM Old Eng. bugge, from W. bwg, bwgan, hobgoblin, scarecrow, bugbear. Related to Bogey, Boggle.
1. A fault or defect in a system or machine; SYN. glitch.
2. A small hidden microphone; for listening secretly.

General term for any insect or similar creeping or crawling invertebrate.
In entomology, an insect belonging to the order Hemiptera. All these have two pairs of wings with forewings partly thickened.
They also have piercing mouthparts adapted for sucking the juices of plants or animals, the “beak” being tucked under the body when not in use.
They include: the bedbug, which sucks human blood; the shieldbug, or stinkbug, which has a strong odor and feeds on plants; the water boatman and other water bugs.

1. An error in coding or logic that causes a program to malfunction or to produce incorrect results. Minor bugs, such as a cursor that does not behave as expected, can be inconvenient or frustrating, but do not damage information. More severe bugs can require the user to restart the program or the computer, losing whatever previous work had not been saved. Worse yet are bugs that damage saved data without alerting the user. All such errors must be found and corrected by the process known as debugging. Because of the potential risk to important data, commercial application programs are tested and debugged as completely as possible before release. After the program becomes available, further minor bugs are corrected in the next update. A more severe bug can sometimes be fixed with a piece of software called a patch, which circumvents the problem or in some other way alleviates its effects. See also beta test, bomb2, crash2 (definition 1), debug, debugger, hang, inherent error, logic error, semantic error, syntax error.
2. A recurring physical problem that prevents a system or set of components from working together properly. While the origin of this definition is in some dispute, computer folklore attributes the first use of bug in this sense to a problem in the Harvard Mark I or the Army/University of Pennsylvania ENIAC that was traced to a moth caught between the contacts of a relay in the machine (although a moth is not entomologically a true bug).
In computing, an error in a program. It can be an error in the logical structure of a program or a syntax error, such as a spelling mistake. Some bugs cause a program to fail immediately; others remain dormant, causing problems only when a particular combination of events occurs. The process of finding and removing errors from a program is called debugging.
Name of two rivers in E Europe: the West Bug rises in SW Ukraine and flows to the Vistula, length 768 km/480 mi, and the South Bug rises in W Ukraine and flows to the Black Sea, length 853 km/530 mi.

1. River over 450 miles (720 kilometers) central Europe rising in W Ukraine, forming part of Ukraine-Poland and Poland-Belarus borders, and flowing into the Vistula in Poland.
2. River over 500 miles (805 kilometers) SW Ukraine flowing SE to the Dnieper estuary.