Sentence:  No one else had really understood how to operate the automatic <WSD>toggler</WSD>; and xyz Company had no service agreement or other contract with the manufacturer. So the <WSD>toggler</WSD> was pushed into the stationery cupboard, where it remained until the company went bankrupt a few years later. 
Meaning of the word marked with <WSD> tags:  Something that toggles between two states or causes something else to toggle between two states.