| 1. | a sawhorse. |
| 2. | Gymnastics. a cylindrical, leather-covered block mounted in a horizontal position on a single vertical post set in a steel frame, for use chiefly in vaulting. |
| 3. | any of various heavy frames, racks, or jigs used to support materials or partially assembled items during manufacture, as in airplane assembly plants. |
| 4. | Also called door buck. a doorframe of wood or metal set in a partition, esp. one of light masonry, to support door hinges, hardware, finish work, etc. |
| 5. | to split or saw (logs, felled trees, etc.). |
| 6. | buck in, Surveying, Optical Tooling. to set up an instrument in line with two marks. |