A woman frantically hurried kids into lockdown while NFL player Malik McDowell was roaming naked nearby ... new 911 audio, obtained by TMZ Sports, reveals.
In a call to dispatch ... a female can be heard on the line saying a man -- later identified as Cleveland Browns defensive lineman McDowell -- was "naked walking the premises" in Deerfield Beach, Fla.
The call is redacted, so it's unclear where the woman exactly is, but it seems she's calling from the school that cops say McDowell had walked near before his arrest on Monday afternoon.