一いち枚まい看かん板ばん

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Meanings

1

star performer; leading player; box-office draw

yojijukugo (four-character idiom)

Originally from theater, referring to the single main attraction or star whose name is on the signboard. Now used for any field's standout performer.

彼かれはこの劇げき団だんの一いち枚まい看かん板ばんだ。
He is the star performer of this theater company.
あの歌か手しゅは事じ務む所しょの一いち枚まい看かん板ばんとして活かつ躍やくしている。
That singer is active as the agency's leading star.

2

one's best asset; sole strong point; trump card

yojijukugo (four-character idiom)

Extended figurative use: the one thing or person you can proudly show off, often implying it's the only notable asset.

この料りょう理りがうちの店みせの一いち枚まい看かん板ばんです。
This dish is our restaurant's signature item.
彼かれの一いち枚まい看かん板ばんは英えい語ご力りょくだ。
His one strong point is his English ability.