隠れてた

was hiding, had been hiding

→ 隠れる
隠れ hide, hide oneself + て Te-form (conjunctive form) + た Past tense
verb · informal, past tense Rare #29,907
was hiding, had been hiding Conversational contraction of 隠れていた.
JA: 猫がベッドの下に隠れてた。
EN: The cat was hiding under the bed.
Conjugation of 隠れる
Indicative past
隠れてた

隠れてたのか?

Were you hiding?

— 恋する惑星 (1994)

ドアの後ろに隠れてた

I was hiding behind the door.

— レベッカ (1940)

三週間ずっとここに隠れてたんだ

I've been hiding here for three weeks.

— ライフ・イズ・ビューティフル (1997)

半年も隠れてたんだ

You’d been hiding for half a year.

— ロシアン・ブラザー (1997)

隠れてた!

You were hiding!

— 天空の城ラピュタ (1986)

あの子どこに隠れてたの?

Where was that kid hiding?

— 海の上のピアニスト (1998)

こんな所に隠れてたのね

So this is where you've been hiding.

— 動くな、死ね、甦れ! (1990)