養虎為患

lit. to nurture a tiger invites calamity / fig. to indulge one's enemy is asking for trouble (idiom)

to raise (animals) / to bring up (children) / to keep (pets) / to support / to give birth

tiger / CL:隻|只[zhi1]

as (in the capacity of) / to take sth as / to act as / to serve as / to behave as / to become / to be / to do / by (in the passive voice)

because of / for / to

to suffer (from illness) / to contract (a disease) / misfortune / trouble / danger / worry