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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.
Re: Completing application without DL Audit number. The audit number is a unique identifying number for tracking when and where the DL was issued. It identifies such things as DL office number, camera that took the photo, date of issuance, and sequence number. The number is unique to each person processed.