代だい理り公こう使し

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Meanings

1

chargé d'affaires

A diplomatic rank below ambassador; the head of a diplomatic mission in the absence of an ambassador, or a lower-ranking envoy.

えい

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。

While the ambassador was away, the chargé d'affaires ran the embassy.

大たい使し
大使 is a full ambassador, the highest-ranking diplomatic representative, while 代理公使 is a lower rank or temporary head of mission.
公こう使し
公使 is a minister (envoy), a rank above chargé d'affaires but below ambassador; 代理公使 is specifically a chargé d'affaires, often acting in place of an ambassador or minister.

Compound of 代理 (dairi, 'acting, proxy') and 公使 (kōshi, 'minister, envoy'). The term is a direct translation of the French 'chargé d'affaires'.