panty liner
US /ˈpæn.ti ˌlaɪ.nər/
UK /ˈpæn.ti ˌlaɪ.nər/

1.
a thin, absorbent pad worn inside underwear to absorb daily vaginal discharge, light menstrual flow, or light urinary incontinence
:
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She uses a panty liner daily for freshness.
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You can find panty liners in the feminine hygiene aisle.