noun
eaves; edge of the eaves
Refers to the overhanging lower edge of a roof, often where rainwater drips off. Used in both everyday and literary contexts.
軒端から雨だれが落ちている。
Raindrops are falling from the edge of the eaves.
軒端にツバメが巣を作った。
A swallow built a nest under the eaves.
軒 (のき) refers to the eaves in general, while 軒端 (のきば) specifically means the edge or tip of the eaves.
Compound of 軒 (のき, 'eaves') and 端 (は, 'edge'), with rendaku voicing of は to ば.