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つけていた

was adding; had added

→ つける
phrase Common #6,378
was adding; had added The form ていた can describe an action that was ongoing in the past or one completed before a later point. The meaning of つける depends on context.
JA: 彼はリストに名前をつけていた。
EN: He was adding names to the list.

彼女は口紅をたくさんつけていた。

She was wearing a lot of lipstick.

彼は拳銃を身につけていた。

He was carrying a handgun.

私は君に目をつけていた。

I'd had my eye on you.