Translation guide
How to express 'talking big' in Japanese, from casual bragging to formal grandstanding.
To talk about one's achievements, abilities, or possessions in a proud, self-aggrandizing way, often in informal settings.
The most common and neutral way to say 'to boast' or 'to brag'. Can be used for oneself or others.
彼はいつも自分の車を自慢している。
He's always bragging about his car.
To act big, throw one's weight around; implies arrogance and a show of superiority, not just words.
あいつは金持ちになったからって威張っている。
He's been talking big ever since he got rich.
Literally 'to beat a big mouth'; means to talk big, make exaggerated claims or empty boasts.
彼は大口を叩くけど、実際は何もできない。
He talks big, but can't actually do anything.
To tell tall tales, to boast in a way that is clearly exaggerated or untrue. More like 'to blow smoke'.
また彼がほらを吹いている。
He's talking big again.
To promise or declare something in an exaggerated, often insincere or unachievable way, especially in public or formal contexts.
A formal, four-character compound meaning 'to talk big' or 'to make grandiose statements'. Often used in political or business contexts.
彼の大言壮語にはうんざりだ。
I'm fed up with his big talk.
A straightforward, slightly colloquial phrase meaning 'to say big things'. Can be used for both positive ambition and empty boasting.
彼はよく大きなことを言うが、実行が伴わない。
He often talks big, but doesn't follow through.
To declare proudly or boastfully, often about one's future plans or abilities. Can be used in both positive and negative senses.
彼は一人でできると豪語した。
He talked big, saying he could do it alone.
To speak in a way that shows an exaggerated sense of one's own importance or knowledge, often using difficult words or a condescending tone.
To say something in a self-important, condescending way. Very common in everyday speech.
彼はいつも偉そうに言うけど、大したことないよ。
He always talks big, but he's nothing special.
To act like one knows everything; to be a know-it-all. Implies talking big about knowledge one doesn't really have.
彼の知ったかぶりには我慢できない。
I can't stand his big talk.
自慢する focuses on the act of boasting about specific things (possessions, achievements), while 威張る describes an arrogant attitude or behavior, often without specific content. 大口を叩く is specifically for exaggerated or empty talk.
Directly translating 'talk big' as 大きく話す (ookiku hanasu) is unnatural. Use the idiomatic expressions provided.
実行できないなら大口を叩くな。
Don't talk big unless you can back it up.
彼は大口を叩くけど、本当は臆病者だ。
He talks big, but he's actually a coward.