might and main

(with) might and main

With as much effort or strength as one can muster. She attacked that punching bag with might and main. If you're not happy in your current job, then you should be working might and main to find a new one.
See also: and, main, might

might and main

Cliché great physical strength; great force. The huge warrior, with all his might and main, could not break his way through the castle gates. The incredible might and main of the sea crushed the ship against the cliff.
See also: and, main, might
References in classic literature ?
Tom scampered after him, hallooing with might and main, and the wild horse and wild Irishman soon disappeared among the ravines of the prairie.