Sentence:  He turned the knob, but the door was locked. Retracing his steps past a vacant lot, the young man entered a shop where a colored man was employed in varnishing a coffin, which stood on two <WSD>trestles</WSD> in the middle of the floor. 
Meaning of the word marked with <WSD> tags:  A folding or fixed set of legs used to support a tabletop or planks.