This is the 17669th most frequent Russian word.
увлажнять
To moisturize or to make damp.
The verb "увлажнять" is used here in the context of skincare to mean "to moisturize."
Необходимо увлажнять кожу ежедневно.
It is necessary to moisturize the skin daily.
Here, "увлажнять" refers to moistening wood to preserve its properties.
Для сохранения гибкости дерева нужно увлажнять его поверхность.
To maintain the flexibility of wood, one needs to moisten its surface.
In this instance, "увлажнять" is used in the sense of increasing the air's humidity.