The NFL Competition Committee is reportedly working to remove hip-drop tackles with a new rule, per NFL.com's Judy Battista.
According to Battista the committee is "aligned" on getting rid of hip-drop tackles but is still working on figuring out the right language for the new rule.
A hip-drop tackle is when a defender wraps up an offensive player from behind or the side and then drops their legs, becoming deadweight and bringing the player down. Often, the defender lands on the offensive player's legs, which is more likely to cause an injury than a typical tackle.