凹ます[hekomasu] to dent
凹ませる[hekomaseru] to dent
凹まる[kubomaru] to be low (as a hollow)
凹む[hekomu] to be dented
凹める[kubomeru] to hollow out

凹レンズ[ourenzu] concave lens
凹眼[ougan] cavernous eyes
凹眼鏡[ougankyou] concave glasses
凹型[ougata] concavity

牙纛[gatou] flagstaff decorated with ivory carried by the emperor or a general

大纛[taitou] large decorative black flagpole tassel made from tail hair (of a yak, horse, ox, etc.) or dyed hemp