turn over a new leaf
(inorganic chemistry) The anion BF₄⁻ and any salt containing this ion; they have a number of uses in synthetic chemistry
A low sound associated with extended suffering, sorrow, and toil. / (obsolete) Ellipsis of groaning time. (childbirth, labour)
(idiomatic) To engage in self-improvement; to begin a good habit or shed a bad habit.
The folding of paper; origami
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