The fever has abated.
Netsu ga sagatta.
heat; fever; temperature; zeal; passion; enthusiasm; mania; craze; rage
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
to come down; to go down; to fall; to drop; to sink; to get lower; to hang; to dangle; to move back; to step back; to withdraw; to retire; to deteriorate; to fall off; to be downgraded; to get closer to the present day; to go south