а> начинать путешествие (for/on); The children were always excited to start off on a camping trip; б> начинать говорить; The chairman started off by attacking the first speaker.
START OFF
Англо-русский перевод START OFF
English-Russian Muller's dictionary 24 edition. Англо-Русский словарь Мюллера 24 редакция. 2012