~ 1
■ verb
1》 (of the moon) have a progressively smaller part of its visible surface illuminated, so that it seems to decrease in size.
2》 become weaker.
Phrases
on the ~ becoming weaker or less vigorous.
Origin
OE wanian 'lessen', of Gmc origin; related to L. vanus 'vain'.
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~ 2
■ noun the amount by which a plank or log is bevelled or falls short of a squared shape.
Derivatives
~y adjective
Origin
C17: from ~ 1 .