Cogs, wheels, cogwheels, cog wheels, sprockets, etc. ? Cog traditionally referred to the individual teeth on the cogwheel Here is the first definition in "cog, n 2" in the Oxford English Dictionary: One of a series of teeth or similar projections on the circumference of a wheel, or the side of a bar, etc , which, by engaging with corresponding projections on another wheel, etc , transmit or receive motion A wheel with cogs would be more
idioms - What does the phrase: Lets throw a little wrench in his . . . The expression is most likely a variation of the idiom to put throw a spanner in the works It describes the act of sabotaging or hindering a plan or project The origin is rather obvious in this case if you think about, for example, throwing a wrench (AE) or spanner (BrE) into the spokes of a turning wheel
word choice - Self-Learner vs Self-Taught vs Autodidact - English . . . I would recommend using ' self-taught ' or ' autodidact ' over 'self-learner' Have a look at this ngram: Enlarge Hence literary sources suggests that 'self-learner' isn't been used that very often compared to the others But in cases where you want to suggest that you have a quality to take initiatives and learn things on your own (like in the future), 'self learner' would fit fine And for