The phrase "to harm the liver" means to cause damage or negative effects to the liver, which is an important organ in our bodies that helps filter and process substances. Full definition
The only «side note» she mentioned was that we would have to get Jet's liver enzyme levels checked after a month to ensure that the drug was not harming his liver while it was being processed. (caninejournal.com)
Exposure to smoke residue increases rodents» stress hormones and puts them at higher risk of diabetes, as well as harming their livers and brains (newscientist.com)
Bottom Line: Regular consumption of excess alcohol harms the liver. (wellnessmama.com)