It means ‘minor sins’.
(those who avoid major sins and shameful deeds, despite ˹stumbling on˺ minor sins. Surely your Lord is infinite in forgiveness. He knew well what would become of you as He created you from the earth and while you were ˹still˺ fetuses in the wombs of your mothers. So do not ˹falsely˺ elevate yourselves. He knows best who is ˹truly˺ righteous.) [An-Najm 53:32]
بمعنى الصغير من الذنوب
(ٱلَّذِينَ يَجۡتَنِبُونَ كَبَـٰٓٮِٕرَ ٱلۡإِثۡمِ وَٱلۡفَوَٲحِشَ إِلَّا ٱللَّمَمَۚ إِنَّ رَبَّكَ وَٲسِعُ ٱلۡمَغۡفِرَةِۚ هُوَ أَعۡلَمُ بِكُمۡ إِذۡ أَنشَأَكُم مِّنَ ٱلۡأَرۡضِ وَإِذۡ أَنتُمۡ أَجِنَّةٌ۬ فِى بُطُونِ أُمَّهَـٰتِكُمۡۖ فَلَا تُزَكُّوٓاْ أَنفُسَكُمۡۖ هُوَ أَعۡلَمُ بِمَنِ ٱتَّقَىٰٓ النجم 53: 32