To become sallow.
To cause (someone or something) to become sallow.
(of skin) Yellowish.
(of a person) Having skin (especially on the face) of a sickly pale colour.
(of objects or dim light) Having a similar pale, yellowish colour.
Dirty; murky.
A European willow, Salix caprea, that has broad leaves, large catkins and tough wood.
A willow twig or branch.