The character 厓 is an old form of 崖, meaning a cliff or steep edge.
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厓 is not used independently in modern Chinese. It is an early form behind two modern characters: 崖 (cliff), which adds the 山 mountain on top, and 涯 (shore), which adds the water radical.
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Archaic; appears in old texts and etymology notes, replaced by 崖 and 涯 in modern writing.