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見てたら

if/when (someone) was watching or looking; while (someone) was watching or looking

→ 見る
見 see; look at + て Te-form (conjunctive form) + た Past tense + ら conditional (if/when)
verb · informal Rare #41,222
if/when (someone) was watching or looking; while (someone) was watching or looking A colloquial contraction of 見ていたら.
JA: テレビを見てたら、友達から電話が来た。
EN: While I was watching TV, a friend called.
Conjugation of 見る

誰かが長く見てたら

If someone has been watching for a long time

— 罪人たち (2025)

もし誰かがちょっと長く見てたらクラクションを鳴らしてくれいいな？

If anyone watches for a little too long, honk the horn, okay?

— 罪人たち (2025)

ケイティのことで来たんだテレビでも見てたらどうだ？

I'm here about Katie. Why don't you watch some TV or something?

— ミスティック・リバー (2003)

もし誰かが私たちを見てたらどうする？

What would you do if someone were watching us?