a small tool for putting on make-up that has a piece of sponge (= a soft material) at the end with a sloping edge

This is a liquid lip colour with a doe foot applicator. 这是一款带绒面刷的液体唇彩。

Makeup artists use the term “doe foot” to describe the type of spongy-tipped wands found in tubes of lip gloss. 化妆师用“鹿脚”一词来形容唇彩管中那种带海绵头的唇彩刷。