[syn: affect, impact, bear upon, bear on, touch on, touch]
The Collaborative International Dictionary of English v.0.48:
touch on \touch" on\, v. t.
   To mention briefly, or in passing.
   [PJC]
WordNet (r) 3.0 (2006):
touch on
    v 1: refer to or discuss briefly
    2: be relevant to; "There were lots of questions referring to
       her talk"; "My remark pertained to your earlier comments"
       [syn: refer, pertain, relate, concern, come to,
       bear on, touch, touch on, have-to doe with]
    3: restore by replacing a part or putting together what is torn
       or broken; "She repaired her TV set"; "Repair my shoes
       please" [syn: repair, mend, fix, bushel, doctor,
       furbish up, restore, touch on] [ant: break, bust]
    4: have an effect upon; "Will the new rules affect me?" [syn:
       affect, impact, bear upon, bear on, touch on,
       touch]