lip liner
US /ˈlɪp ˌlaɪ.nər/
UK /ˈlɪp ˌlaɪ.nər/

1.
唇線筆, 唇線
a cosmetic product applied to the contours of the lips to define them, prevent lipstick from bleeding, or create a fuller appearance
:
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She used a nude lip liner to create a natural look.
她用裸色唇線筆打造自然妝容。
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Always apply lip liner before lipstick for a precise finish.
塗口紅前務必先用唇線筆,以獲得精準妝效。