/uyd"leuhr/ , n.
1. a person who passes time in a lazy or unproductive way.
2. Mach. an idle gear, wheel, or pulley.
3. Railroads. an empty freight car placed under the projecting end of a long object carried by the next car, so that the latter can be connected with another part of the train.
4. Naut. See day man (def. 2).
[ 1525-35; IDLE + -ER 1 ]