Aquinas' definition. The Oxford Concise Dictionary of the Christian Church defines acedia (or accidie) as a state of restlessness and inability either to work or to pray. Some see it as the precursor to slothâone of the seven deadly sins.
A train horn is a powerful air horn that serves as an audible warning device on electric and Diesel locomotives. The horn's primary purpose is to alert persons and animals to an oncoming train, especially when approaching a grade crossing. The horn is also used for acknowledging signals given by railroad employees, such as during switching operations.
distress signal - an internationally recognized signal sent out by a ship or plane indicating that help is needed. distress call. signal, signaling, sign - any nonverbal action or gesture that encodes a message; signals from the boat suddenly stopped. SOS - an internationally recognized distress signal in radio code.