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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.
Database Description (DBD) Generation utility. Use the Database Description Generation (DBDGEN) utility to define a database so that it can be used by an application program. A database description (DBD) is a DL/I control block containing all of the database information needed by an application program. You create a database description (DBD) by coding special macro instructions. These macros become the input to the DBDGEN utility.