The woman first shoved the child to the train’s floor as the two angled for a subway seat, then whipped out a knife and hissed she would “cut” the boy and his mom, cops said.

Police are searching for the woman who shoved a 7-year-old boy at a subway station in Queens before threatening him and his mother with a knife.

Detectives in Queens are on the hunt for the unhinged woman who assaulted a 7-year-old boy and threatened his mother with a knife in a subway station last month. According to police sources, the boy and his 37-year-old mother were accosted while waiting on the Jamaica-bound platform at the 21st Street-Queensbridge station on the