BOSTON — The drug plague gripping the city spilled out in broad daylight Monday when cops say they caught a Dorchester woman pushing deadly fentanyl and crack cocaine in the heart of Boston’s “Mass & Cass” corridor.

Police say 51-year-old Cyndi Blount was working the strip like a street-corner veteran, brazenly conducting hand-to-hand trades along Massachusetts Avenue. At 2:47 p.m., undercover officers swooped in after watching her hawk her stash. A buyer stopped just blocks away was allegedly caught red-handed with a baggie of crack.

When cops moved in on Blount near 891 Mass Ave, the haul stunned even hardened narcotics detectives: 43 grams of fentanyl and 47 grams of crack cocaine — the kind of poison that can ravage an entire neighborhood. Bags of fentanyl, loose rocks of crack, and even a chunk pulled straight from her pants pocket spilled out as officers catalogued the evidence.

Cash was seized too, though police aren’t saying how much money Blount had on her when she was cuffed.

Blount now faces a stack of charges — trafficking Class A and B drugs, distribution, and repeat-offender raps that could put her away for years. But in a jaw-dropping twist, cops say that while being booked she swallowed a stash of fentanyl in a desperate bid to dodge justice, sending her straight to the ER before she was hauled back to the station.

A grandma turned fentanyl crack dealer or just a street-corner veteran — one thing’s for sure, she’ll be seeing the judge. Whether Boston’s courts hand down real punishment or let her off with a slap on the wrist like so many others remains to be seen.