decay, rot, remain in seclusion
朽 centers on organic breakdown and decline: wood rotting, things decaying, or a person withdrawing from the world into seclusion as a kind of social decay.
朽 combines 木 (tree/wood) with 丂, which likely contributes the sound and suggests decay or rot. The exact historical role of 丂 is uncertain.
A tree 木 beside a decaying shape 丂: picture a rotting log crumbling away, its wood breaking down into decay.
For キュウ, imagine a decaying wooden cue stick in a pool hall: cue -> キュウ, and the old cue is rotting away.
infirmity (due to old age); decrepitude; senility; senescence; superannuation
to rot; to decay
everlasting; immortal; eternal; enduring; undying; imperishable
decayed tree; rotted tree; decayed wood; rotten wood
decay; deterioration; rot
to rot away; to crumble to dust; to decay completely; to fall to ruins; to rust away
timeless masterpiece; immortal work
everlasting; eternal; immortal; imperishable; undying
dry rot
wood-decay fungus; xylophagous fungus
decayed leaves
russet; tawny; yellow-brown
rotting and crumbling
decay; dilapidation
one's fame or achievements being passed down eternally
deterioration; becoming decrepit; becoming worn out
wood-decay fungus; xylophagous fungus
being young yet unambitious; being young but lacking spirit
once bitten twice shy; to become over cautious from a bad experience; to be bitten by a snake and thus fear a rotten rope (which resembles a snake)
bluish russet