1. [n]  the act of making a noisy disturbance
2. [n]  a loud harsh or strident noise
3. [v]  instill (into a person) by constant repetition; "he dinned the lessons into his students"
4. [v]  make a resonant sound; as of artillery; "His deep voice boomed through the hall."

1. \Din\, n. [AS. dyne, dyn; akin to Icel. dynr, and to AS.
   dynian to resound, Icel. dynja to pour down like hail or
   rain; cf. Skr. dhuni roaring, a torrent, dhvan to sound. Cf.
   {Dun} to ask payment.]
   Loud, confused, harsh noise; a loud, continuous, rattling or
   clanging sound; clamor; roar.
   
         Think you a little din can daunt mine ears? --Shak.
   
         He knew the battle's din afar.           --Sir W.
                                                  Scott.
   
         The dust and din and steam of town.      --Tennyson.
   
   

2. \Din\, v. t. [imp. & p. p. {Dinned}; p. pr. & vb. n.
   {Dinning}.] [AS. dynian. See {Din}, n.]
   1. To strike with confused or clanging sound; to stun with
      loud and continued noise; to harass with clamor; as, to
      din the ears with cries.
   
   2. To utter with a din; to repeat noisily; to ding.
   
            This hath been often dinned in my ears. --Swift.
   
   {To din into}, to fix in the mind of another by frequent and
      noisy repetitions. --Sir W. Scott.
   
   
   
   

3. \Din\, v. i.
   To sound with a din; a ding.
   
         The gay viol dinning in the dale.        --A. Seward.
   
   

Deutsche Institut fuer Normung. The German standardisation body, a member of iso.