might and main

A reduplication of two words meaning strength.

might and main (not comparable)

1. With all one's strength; as hard as one can.
   • 1849, Herman Melville, “Chapter XVI”, in Redburn: His First Voyage. […], 1st American edition, New York, N.Y.: Harper & Brothers, […], →OCLC:

     […] I found myself hanging on the skysail-yard, holding on might and main to the mast; and curling my feet round the rigging, as if they were another pair of hands.

   • c.1890s, Giovanni Boccaccio, James McMullen Rigg (translator), The Decameron, Novel 1, 6,

     […] he strove might and main to pass himself off as a holy man […]

   • 1907, Robert W. Service, The Younger Son, from Songs of a Sourdough,

     When the sunlight threads the pine-gloom he is fighting might and main / To clinch the rivets of an Empire down.

might and main (uncountable)

1. All one's strength.
   • 1836 March – 1837 October, Charles Dickens, “(please specify the chapter name)”, in The Posthumous Papers of the Pickwick Club, London: Chapman and Hall, […], published 1837, →OCLC:

     Mr. Winkle, catching sight of a lady's face at the window of the sedan, turned hastily round, plied the knocker with all his might and main, and called frantically upon the chairman to take the chair away again.

   • 1847 March 30, Herman Melville, “The Hegira, or Flight”, in Omoo: A Narrative of Adventures in the South Seas; […], London: John Murray, […], →OCLC, page 246:

     Thinking that we were about to be taken up under the act for the suppression of vagrancy, we flew out of the house, sprang into a canoe before the door, and paddled with might and main over to the opposite side of the lake.

   • 1852, Catherine M. Sedgwick, The Sabbath In New England, in John Seely Hart (editor), The Female Prose Writers of America: With Portraits, Biographical Notices, and Specimens of their Writings,

     The good mothers, like Burns’s matron, are plying their needles, making "auld claes look amaist as weel’s the new;" while the domestics, or help (we prefer the national descriptive term), are wielding, with might and main, their brooms and mops, to make all tidy for the Sabbath.

   • 1908, Lucy Maud Montgomery, chapter XXXI, in Anne of Green Gables:

     "I feel just like studying with might and main," she declared as she brought her books down from the attic.

• horse and foot