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might and main, with

might and main, with idiom

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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.