Drip Lock : A means of securing a door that has been forced by nailing a piece of lumber to the floor and a piece to the door to form a chock between which a piece of wood can be placed to prevent opening
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}