might and main, with
Strenuously, vigorously, as in She pulled on the rope with all her might and main. This expression is redundant, since the noun main also means “strength” or “power.” It survives only in this phrase, which may also be dying out. [Late 1200s]
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What Is The Difference Between “Might” And “May”?May expresses likelihood while might expresses a stronger sense of doubt or a contrary-to-fact hypothetical. The difference in degree between “You may be right” and “You might be right” is slight but not insignificant: if I say you may be right about something, there is a higher degree of probability that you are right about it than if I say you might be right about something. Example: You think Einstein is the most brilliant physicist who …
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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.