noun
wide brim
Refers to the wide brim of a hat or cap. Often used attributively as in 鍔広の帽子.
彼は鍔広の帽子をかぶっていた。
He was wearing a wide-brimmed hat.
鍔 (つば) means 'brim' or 'visor'; 鍔広 is specifically a wide brim.
Compound of 鍔 (つば, 'brim') and 広 (ひろ > びろ, 'wide').