The phrase "slightest slip" means making a small mistake or error.
Sentences with «slightest slip»
Accuracy is paramount, and all it takes is one slight slip up to send you hurtling ingloriously down the side of a skyscraper to your death. (dealspwn.com)
But one slight slip in the defense — East's failure to cash his second high trump at once — left the tiny chink through which Lazard pulled home his contract. (si.com)
It knows that the slightest slip in top quality goods and services will endanger it immensely. (socionomics.net)