to wane is a form of:

Wane



noun
1.
(បច្ចេកទេស) ការរួញតូចទៅ (អំណាចឬសារៈសំខាន់..)
verbpast tense: waned ; past participle: waned ; present participle: waning ;
1.
រួញតូចទៅ on the wane ដែលថយចុះសន្សឹមៗ, ដែលរួញតូចទៅ
ENGLISH MEANING
noun
1.
The decrease of the illuminated part of the moon to the eye of a spectator.
2.
Decline; failure; diminution; decrease; declension.
3.
An inequality in a board.
4.
The natural curvature of a log or of the edge of a board sawed from a log.
verbpast tense: waned ; past participle: waned ; present participle: waning ;
1.
(INTRANSITIVE) To be diminished; to decrease; -- contrasted with wax, and especially applied to the illuminated part of the moon.
2.
(TRANSITIVE) To cause to decrease.
1.
To decline, to fail, to sink