Tightening a Loose Seat. Some toilet seat bolts are exposed, but most just have a plastic flap that snaps closed to cover them. Lift the cover that sits over the toilet seat bolts so you can see what type of bolt fastens the seat to the toilet bowl. This can be easily done with a flat screwdriver.
3. countable noun. A circuit is a series of places that are visited regularly by a person or group, especially as a part of their job. He joined the professional circuit. It's a common problem, the one I'm asked about most when I'm on the lecture circuit. Synonyms: course, round, tour, track More Synonyms of circuit.
The definition of an open circuit is  a broken path for an electrical current due to an open switch or frayed wire. An example of an open circuit is a string of electric lights that donât work if one bulb goes out.