僕は猫背だ。

僕は猫背だ。

I am round shouldered.

僕(ぼく)は猫背(ねこぜ)だ。

Boku wa nekoze da.

僕 (ぼく)

I; me; you; manservant

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

猫背 (ねこぜ)

bent back; hunchback; stoop

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: ボク、しもべ

Meanings: me, I (male)

Readings: ビョウ、ねこ

Meaning: cat

Readings: ハイ、せ、せい、そむ.く、そむ.ける

Meanings: stature, height, back, behind, disobey, defy, go back on, rebel