speak to

verb (intr, preposition)
  1. to address (a person)
  2. to reprimandyour father will speak to you later
  3. formal to give evidence of or comments on (a subject)who will speak to this item?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012