noun
underpants; undershorts
Refers to underwear worn on the lower body, such as briefs, boxers, or panties. A common everyday term.
新しい下ばきを買った。
I bought new underpants.
旅行のときは下ばきを多めに持っていく。
When traveling, I take extra underwear.
Compound of 下 (した, 'lower') + 履き (はき, 'wearing on the lower body'), from the verb 履く (はく, 'to wear on the lower body'). The spelling 下ばき is a common okurigana representation.