slip a cog

slip a cog или slip a gear  {v. phr.},  {slang}
Допускать ошибку.
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.
Ср.: SLIP UP.
Категории: {slang} {v. phr.}

'slip a cog' on video