(1 syl.). To shoot with roving arrows—i.e. arrows shot
at a roving mark, either in height or distance.
To shoot at rovers.
To shoot at certain marks of the target so called; to shoot at
random without any distinct aim.
“Unbelievers are said by Clobery to `shoot at rovers.” —Divine
Glimpscs, p. 4 (1659).
Running at rovers.
Running wild; being without restraint.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894