chestnut
noun uk/ˈtʃes.nʌt/ us/ˈtʃes.nʌt/
[ C ] US plural also chestnut (UK sweet chestnut)栗树
a large tree with leaves divided into five parts and large, round nuts
a 200-year-old chestnut tree 有200年树龄的栗树
forests full of oak and chestnut 长满橡树和栗子树的森林
Compare: horse chestnut
栗子，板栗
a large, brown nut that grows on a sweet chestnut tree, often cooked and eaten hot
A man in the street was selling bags of roast chestnuts. 街上有个人在卖成袋的炒栗子。
[ C ]栗色马;红棕马
a reddish-brown horse
[ U ]栗色，红褐色，红棕色
a reddish-brown colour
Idiom
old chestnutidiom informal 老掉牙的话题（或想法、笑话）
a subject, idea, or joke that has been discussed or repeated so often that it is not funny any more
I wondered whether there might, after all, be some truth in the old chestnut that one's school days are the happiest of one's life. 老话说学生时代是人一生中最幸福的时光，我在想这话是否有些道理。
chestnut
adjective uk/ˈtʃes.nʌt/ us/ˈtʃes.nʌt/
栗色的，红褐色的，红棕色的
reddish-brown in colour