1. to leaven too much, as in let bread rise too much
2. by extension to spoil by changing too much
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Uses:
Since nature cannot choose his origin, — By the o'ergrowth of some complexion, Oft breaking down the pales and forts of reason; Or by some habit, that too much o'er-leavens The form of plausive manners; — that these men, — Carrying, I say, the stamp of one defect,