Webster's English Dictionary

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complain

com.plain \k*m-'pla-n\ \-'pla--nin-le-\ vi [ME compleynen, fr. MF 
   complaindre, fr. (assumed) VL complangere], fr. L com- + plangere to lament 
   - more at PLAINT 1: to express grief, pain, or discontent  2: to make a 
   formal accusation or charge  - com.plain.er n