A Bronx straphanger who held the emergency gate open for other riders was slashed repeatedly during a Monday morning clash, according to cops and a report.

The 37-year-old man was knifed all over his body when tensions flared with a blade-wielding brute inside the No. 4 train station at West 170th Street and Jerome Avenue in Mount Eden, authorities said.

The victim was holding the gate open when the violence erupted, AM NY reported.

He was taken to Lincoln Medical Center, where he is listed in stable condition.

No arrests have been made in the early-morning burst of violence.

The attack came just days after a crazed stranger shoved an NYU…

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