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Definition of DL. 1  DL is short for down-low, which basically means to keep things under-wraps, to keep a secret or lay low. 2  I'll tell you this, but, you gotta promise to keep it on the DL. D.L. means down low. it means that something is not known to all. if you keep something on the D.L... 2  you don't share it with others. 3  I don't want my Dad to find out, so keep it on the D.L. 4  She like me but keep that on the DL.
C++ language file. .db: Module interface and type descriptions database file (type library). .def: Win32 library definition file. .DES.dlg: Win32 dialog resource file. .dll: Win32 dynamic linked library. .don: Contains successful message following the execution of bmp. .dpc: Source dependency file containing list of dependencies. .dpj: Java source dependency file containing list of dependencies. .dtd: Document type definition file. .dump: Library symbols file. .dxp: Exports definition file. .eng.exe