WordNet (r) 3.0 (2006):

take care
    v 1: be careful, prudent, or watchful; "Take care when you cross
         the street!"
    2: be in charge of or deal with; "She takes care of all the
       necessary arrangements" [syn: take care, mind]
    3: take charge of or deal with; "Could you see about lunch?"; "I
       must attend to this matter"; "She took care of this business"
       [syn: attend, take care, look, see]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "take care":
   attend to business, be alert, be careful, be cautious,
   be obsessed with, bend over backwards, beware, concentrate on,
   exercise care, fix on, focus on, give heed, handle with gloves,
   have a care, lie low, look about one, look lively, look out,
   look sharp, mind, miss nothing, pay attention, pay heed, qui vive,
   scrutinize, study, take good care, take heed, take pains,
   take trouble, tread on eggs, treat gently, watch out