blunder

• vi.つまずく；大きな間違いをする
• vt.間違いを犯す
• n.大きな間違いをする

語源的にはblindと同じ。

blunder

blunder: [14] When blunder first entered the language, it meant ‘stumble around blindly, bumping into things’, which gives a clue to its possible ultimate connection with blind. Its probable source was Old Norse blundra ‘shut one’s eyes’, forerunner of Swedish blunda and Norwegian blunda (Jon Blund is the Swedish equivalent of ‘the sandman’), and very likely a descendant of Indo-European *bhlendhos, from which blind comes. The first record of the modern sense ‘foolish mistake’ comes in Edward Phillips’s The new world of English words 1706.
=> blind

blunder (v.)

mid-14c., "to stumble about blindly," from a Scandinavian source akin to Old Norse blundra "shut one's eyes," from PIE root *bhlendh- (see blind). Meaning "make a stupid mistake" is first recorded 1711. Related: Blundered; blundering.

blunder (n.)

mid-14c., apparently from blunder (v.), though of about the same age.

1. It had been a monumental blunder to give him the assign-ment.

このタスクを彼に与えたのは大間違いだった。

2.The government committed a double blunder .

政府は同じ轍を踏む。

3.to make a terrible blunder

は大きな間違いを犯した

4.She cast a sidelong glance at Eric to see if he had noticed her blunder .

彼女はエリックをそっと斜めに見て、彼が彼女の誤りに気づいているかどうかを見た。

5.I saw that I had been guilty of a careless blunder .

私は自分が不注意で大きな間違いを起こしていることに気づいた。