"To drop the charges" means to withdraw or cancel the legal accusations or charges that have been filed against someone in a court of law. Full definition
The court took decision after the prosecution told the court the court it had dropped the charges against the eight. (ghanapoliticsonline.com)
Fortunately for the quite - sore - plaintiff, the prosecutor dropped the charges after reviewing a surveillance tape of the incident. (chicagopersonalinjurylegalblog.com)
The case bears some similarities, they say, to other recent cases involving Chinese American or Chinese defendants in which federal prosecutors abruptly dropped charges because of improper analysis or insufficient evidence. (sciencemag.org)