bloody sweat

from The Collaborative International Dictionary of English v.0.48

Bloody sweat \Blood"y sweat`\
   A sweat accompanied by a discharge of blood; a disease,
   called sweating sickness, formerly prevalent in England and
   other countries.
   [1913 Webster]

from Easton's 1897 Bible Dictionary

Bloody sweat
the sign and token of our Lord's great agony (Luke 22:44).