Verse meaning
This is the verse translation, not a definition of the individual word.
“Our Lord, do not let our hearts deviate[1] after You have guided us, and grant us Your mercy; for You are the Munificent Bestower.
Source
[1] ’Umm Salamah (رضي الله عنها) reported: “The Prophet (ﷺ) used to pray most by saying: “O He Who changes hearts, make my heart firm in Your religion” (yā Muqallib al-qulūb, thabbit qalbī ‘alā dīnik). When she asked him the reason for this, he (ﷺ) replied, saying: “Umm Salamah, know that every human’s heart is between two Fingers of Allah. Whoever He wills, He makes steadfast, and Whoever He wills He causes to deviate”. [Al-Tirmidhī: 3522]
Source: QuranEnc.com · English Translation - Rowwad Translation Center
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