Idiom Definition:
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"to turn over a new leaf"
to completely change your behavior or attitude in order to be better than you were
to reform and begin again
Synonyms:
ameliorate, amend, better, clean, convert, correct, cure, improve, mend, rearrange, rebuild, reconstruct, redeem, regenerate, rehabilitate, remake, remodel, renew, reorganize, repair, resolve, restore, revise, revolutionize, rework
Literally,
turning over a new leaf (of a calendar). - - - - ->