The word(s) "ambush" appears 3 time(s) in 3 verse(s) in Quran in Muhammad Pickthal translation.

(1) He said: Now, because Thou hast sent me astray, verily I shall lurk in ambush for them on Thy Right Path.

(سورة الأعراف, Al-A'raaf, Chapter #7, Verse #16)
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(2) Then, when the sacred months have passed, slay the idolaters wherever ye find them, and take them (captive), and besiege them, and prepare for them each ambush. But if they repent and establish worship and pay the poor-due, then leave their way free. Lo! Allah is Forgiving, Merciful.

(سورة التوبة, At-Tawba, Chapter #9, Verse #5)
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(3) Lo! hell lurketh in ambush,

(سورة النبإ, An-Naba, Chapter #78, Verse #21)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)