From Longman Dictionary of Contemporary Englishso as to do somethingso as to do somethingformal in order to do something I drove at a steady 50 mph so as to save fuel. We went along silently on tiptoe so as not to disturb anyone. → so
Examples from the Corpus
so as not to• I moved slowly forward so as not to antagonize the two pendulums.• The tribal drumming sessions have been toned down too, so as not to bother neighboring homeowners.• Partly this is so as not to contrast too blatantly with the speech patterns of your characters.• One went on tiptoe so as not to disturb the hush.• It could have been Jamie, padding softly around his flat so as not to disturb the neighbours.• The boats are lowered away and so as not to frighten the whale the crewmen paddle instead of rowing.• I carefully examined every photograph in minute detail through a magnifying glass so as not to miss a thing.• She had left her curtains undrawn so as not to sleep too long in the morning. 