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A chinstrap is a band of cloth, leather, or plastic that runs under your chin and keeps a hat or helmet on your head. You find it on bicycle helmets, building-site hats, army helmets, some sunhats, and old-fashioned caps. You clip or buckle it so a bump, a fall, or the wind cannot flick the thing off. It is a plain, practical word — not slang. Though actually, some people also use chinstrap for a thin beard that follows the jaw, because it has the same shape as the strap. That is a different picture. Here we mean the real strap that holds the hat.
下巴帶
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
chinstrapnoun
- 1
A strip of leather or material used to fasten a hat or helmet under the chin.
- A bridle, the chin-strap or chain.
- Such a deficit was not likely long to escape notice: the regiment was halted in the midst of a manœuvre, and, in the pause that ensued, Nosey demanded, in a grunt of thunder, how, without a chinstrap, I could expect my cap to stick upon my head.
- 2
A form of beard that follows the jawline but does not cover the rest of the chin.
- 3
A band of colour below a bird's mouth, resembling the chinstrap of a helmet.
- A miniature look-alike of the Canada Goose, with a partial white necklace instead of a white chinstrap.
- The dark slate-grey plumage contrasting strongly with white 'chinstrap' is shared only by Blue Eared-pheasant, but their ranges do not overlap.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。