at rovers

Prepositional phrase

obsolete

(obsolete) At casual marks; hence, at random.

Japanese Meaning

無作為に / 偶然に / 適当に

He added tiny crosses at rovers on the ancient chart to show where the shoals might lie.

彼は古い海図の適当な目印の場所に小さな十字を加え、浅瀬がありそうな所を示した。

Sense（1）

(obsolete) At casual marks; hence, at random.

shooting at rovers