Definition of with might and main in US English:

with might and main

phrase

  • With all one's strength or power.

    • ‘As I was about to enter the dojo he begged me to fight with might and main adding that if I put my shoulder out again he would soon mend it!’
    with all one's strength, with everything one has got, to the best of one's ability, as hard as one can, as hard as possible, all out, with maximum force, full force, with full force, full blast, with all the stops out, forcefully, powerfully, strongly, vigorously, enthusiastically
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