Translation guide
The English verb 'wane' describes a gradual decrease in intensity, power, size, or influence. In Japanese, there is no single direct equivalent; instead, various verbs and expressions are used depending on what is waning.
Describing the moon's phase when it appears to decrease in size.
The most common way to say the moon is waning. Literally 'the moon is chipping/waning'.
The moon is starting to wane tonight.
Refers specifically to the last quarter moon, the waning half-moon.
The waning half-moon is visible at dawn.
Describing a gradual loss of strength, authority, or public support.
General verb for decline in power, health, or vigor. Suitable for abstract things like influence.
His influence is waning.
Intransitive verb meaning 'to weaken'. Used for forces, intensity, or momentum.
Means 'to decline' or 'drop', often used for measurable things like support rates or performance.
Approval ratings are waning.
Describing a gradual loss of interest, passion, or emotional intensity.
Describing a gradual decrease in brightness or volume.
衰える (otoroeru) is for decline in ability, health, or power. 弱まる (yowamaru) is for physical force or intensity weakening. 薄れる (usureru) is for feelings, interest, or visibility fading. Choose based on what is waning.
There is no single Japanese verb that covers all uses of 'wane'. Using a dictionary lookup like 衰える for the moon would be unnatural. Always match the verb to the subject.
The party's popularity is waning.
台風の勢力が弱まってきた。
The typhoon's strength is waning.
My passion for her waned.
His motivation has waned.
The music gradually waned.
夕暮れとともに明かりが薄れた。
The light waned with the dusk.