Webster's English Dictionary

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shudder

1. shud.der \'sh*d-*r\ \-(*-)rin\ vi or shud.der.ing [ME shoddren; akin to 
   OHG skutten to shake, Lith kuteti to sh]ake up 1: to tremble convulsively : 
   SHIVER  2: QUIVER 
2. shudder \-(*-)re-\ n : an act of shuddering : TREMOR  - shud.dery aj