See quotation, 1843.
1800. There was a deadening on C.s land as early as 1769.Addisons Reports, p. 306. (N.E.D.)
1843. If the majority of the trees are thus girdled [with deep cuts], the field is calleda deadening,otherwise it is a clearing.B. R. Hall (Robert Carlton), The New Purchase, i. 240.
1850. A few deadnings, or clearings, with here and there a log cabin, occupied by a sturdy squatter.James Weir, Lonz Powers, i. 51 (Phila.).