slip a cog

slip a cog or slip a gear  {v. phr.},  {slang}
To make a mistake.
I must have been slipping a cog when I said that I would run for mayor.
Jim hates to sleep outdoors. He's slipping his gears if he's promised to take the boys camping.
Compare: SLIP UP.
Categories: slang verb

'slip a cog' on video