色いろづく

godan verb (-ku), intransitive verb

change color; turn red/yellow

Primarily used for autumn leaves changing color; can also refer to other natural color changes like fruit ripening.

• 山やまの木き々ぎが色いろづき始はじめた。

  The trees on the mountain have started to change color.

• 秋あきになると、もみじが美うつくしく色いろづく。

  In autumn, the maple leaves turn a beautiful red.

godan verb (-ku), intransitive verb

ripen and change color

Used for fruits and vegetables that change color as they ripen, such as tomatoes or persimmons.

• トマトが赤あかく色いろづいてきた。

  The tomatoes are ripening and turning red.

godan verb (-ku), intransitive verb

become sexually aware; reach puberty

Figurative use, often applied to young people becoming aware of romantic or sexual feelings; somewhat literary or euphemistic.

• 彼かの女じょもそろそろ色いろづく年とし頃ごろだ。

  She's reaching the age where she becomes aware of romance.