Meanings of meditating mischief in English

Some of these, the Bada-Mawidi to wit, are meditating mischief.

When they appear most friendly, they are often meditating mischief.

It will surely be wise to be on our guard, even should the negroes not really be meditating mischief.

The Frenchmen, too, were growing ravenous, and I heard them talking together, and looking at me as if meditating mischief.

But Doughty, the viper in Drake's bosom, was meditating mischief: not exactly treason with Spain, but at least a breach of confidence by telling Burleigh.

"We shall go to the front, where even now Tromp is in command and meditating mischief."