Intensive police activity
; police pressure
put upon criminals
as a result of public resentment
against widespread crime
, newspaper crusades
, political reform
campaigns, etc.; extensive police raids
and arrests. "We can't grift (steal) in this heat. Blow (leave town) for a while.
" Used idiomaticly, as : "The heat is on" -police activity in a given area is at its peak; the police are on one's trail. "Stash (hide) that collat (negotiable loot). You can't fence (sell) it for peanuts (any appreciable sum) when the heat is still on." 2. A revolver or pistol. "Go get the heat. There's some crimp (informer) we gotta take care of (kill)."
- american underworld dictionary - 1950