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嘘をついてた

was lying

→ 嘘
phrase Rare #38,532
was lying Informal contraction of 嘘をついていた, meaning “was telling lies” or “had been lying,” depending on context.
JA: 彼は私にずっと嘘をついてた。
EN: He had been lying to me the whole time.

二人にはずっと嘘をついてた

I've been lying to both of them all along.

— グッバイ、レーニン！ (2003)

今まで嘘をついてたんだな

So you've been lying to me all this time.

— オープン・ユア・アイズ (1997)

女房にはしょっちゅう嘘をついてた。

I was always lying to my wife.

あいつら嘘をついてたのか？

Were they lying?