沈しずみ込こむ

godan verb (-mu), intransitive verb

sink into; sink down

Physical sinking into a surface or substance, often with a sense of depth or being enveloped.

• ぬかるみに足あしが沈しずみ込こんだ。

  My foot sank into the mud.

• ソファに体からだが沈しずみ込こむほど柔やわらかい。

  The sofa is so soft that your body sinks into it.

godan verb (-mu), intransitive verb

get depressed; sink into depression

Metaphorical use describing a person's mood sinking deeply into a depressed state.

• 失しつ恋れんしてから、彼かれは沈しずみ込こんでしまった。

  After the heartbreak, he sank into depression.