“Boastful speech” in Japanese
Short answer
Boastful speech in Japanese is “自慢話” (jimanbanashi). Full meaning: boastful speech, bragging.
Other ways to say “Boastful speech” in Japanese
大口
ookuchi big mouth, mouth opened wide; boastful speech, tall talk, bragging, boasting; large amount, large quantity
オオクチ
ookuchi big mouth, mouth opened wide; boastful speech, tall talk, bragging, boasting; large amount, large quantity
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