From Longman Dictionary of Contemporary Englishsmooth something ↔ away phrasal verbDEAL WITHto get rid of problems or difficulties A few objections have to be smoothed away before we can start the project. → smooth→ See Verb table
Examples from the Corpus
smooth away• The horse dentist will smooth the sharpness away by using a metal rasp which is rubber backwards and forwards over the teeth. 