友達は留守だった。

友達は留守だった。

The friend was absent.

友達(ともだち)は留守(るす)だった。

Tomodachi wa rusu datta.

友達 (ともだち)

friend; companion

は (は)

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

留守 (るす)

absence; being away from home; house-sitting; house-sitter; being left unattended to (of one's studies, etc.); neglecting

だ (だ)

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

Readings: ユウ、とも

Meaning: friend

Readings: タツ、ダ、 -たち

Meanings: accomplished, reach, arrive, attain

Readings: リュウ、ル、と.める、と.まる、とど.める、とど.まる、るうぶる

Meanings: detain, fasten, halt, stop

Readings: シュ、ス、まも.る、まも.り、もり、 -もり、かみ

Meanings: guard, protect, defend, obey