moistening 润湿
moistening[ noun ]
the act of making something slightly wet
<noun.act>
Moisten \Mois"ten\, v. t. [imp. & p. p. {Moistened}; p. pr. &
vb. n. {Moistening}.]
1. To make damp; to wet in a small degree.
A pipe a little moistened on the inside. --Bacon.
2. To soften by making moist; to make tender.
It moistened not his executioner's heart with any
pity. --Fuller.