lenca- ("k") (2) vb. "loose, slacken" (LEK. In the Etymologies as printed in LR, the misreading leuka [for lenka] appears; cf. VT45:27)
Quenya
lehta-
verb. loose, slacken
lenca-
verb. loose, slacken
Noldorin
adleg-
verb. to loose, let loose, release
lehta- (1) vb. "loose, slacken" (LEK)