Webster’s Revised Unabridged Dictionary · 1913
Lopper
Lop′per, n. One who lops or cuts off.
Lop′per, v. i. [imp. & p. p. Loppered; p. pr. & vb. n. Loppering.] [Cf. Prov. G. lübbern, levern, OHG. giliber?n, G. luppe, lab, rennet.] To turn sour and coagulate from too long standing, as milk.