empty boast
collocation空洞的夸口
His promise to finish the work in one day was an empty boast.
他承诺一天完成工作，不过是空洞的夸口。
自夸；吹嘘
先理解核心含义，再看它在真实句子里的用法。
自夸；吹嘘
The act of bragging; exaggeratedly proud talk about oneself.
His claim that he could run a mile in four minutes was an empty boast.
他声称自己能在四分钟内跑完一英里，那是一个空洞的自夸。
自夸；自我吹嘘的夸耀
A brag; ostentatious positive appraisal of oneself.
自夸
speaking of yourself in superlatives
值得夸耀的事物
Something that one brags about.
一种击球方式,球先击中侧墙再击中前墙
A shot where the ball is driven off a side wall and then strikes the front wall.
She made a boast that she would win the competition, and she actually did.
她夸口说她会赢得比赛，而她确实做到了。
They dismissed his boasts as exaggerations.
他们认为他的自夸是夸大之词。
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空洞的夸口
His promise to finish the work in one day was an empty boast.
他承诺一天完成工作，不过是空洞的夸口。
引以为豪的事
It is her proud boast that she has visited every country in Europe.
她走遍了欧洲的每一个国家，这是她引以为豪的事。
夸口；说大话
She made a boast that she could swim across the lake.
她夸口说能游过这个湖。
打一个侧墙球
He hit a boast that caught his opponent completely off guard.
他打了一记侧墙球，让对手完全措手不及。
圣经耶利米书9:23：智慧人不要因他的智慧夸口，勇士不要因他的勇力夸口，财主不要因他的财物夸口。
He always boasts about his expensive car, but his friends find it annoying.
他总是吹嘘自己昂贵的汽车，但朋友觉得很烦。
本杰明·富兰克林：夸耀自己知识的人，反而暴露了自己的无知。
She doesn't boast about her achievements; she lets her work speak for itself.
她不为自己的成就自夸，而是让工作自己说话。
发长 /oʊ/ 音 (如 boat, coat)
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把boast想成boat（船）+s（说）：在船上吹嘘自己的船最大，就是自夸。
语域：mixed 常见场景：formal writing、sports commentary boast 作名词时，表示“自夸”或“值得夸耀的事”多用于正式或书面表达，口语中更常说 brag；表示“侧墙球”时是运动术语，常见于壁球等球类运动的讲解或规则中。
可数名词
Dictionary facts from DICTIONARY_API_DEV, ECDICT, OCTANOVE, WIKTIONARY.