ط ف فṭ-f-f
(ن) طَفَّ يَطُفُّ طَفًّاṭaffa yaṭuffu ṭaffan (original form: طَفَفَ يَطْفُفُṭafafa yaṭfufu): to come close to something; to reach the edge.
طَفِيْفṭafīf: a little; deficient.
Form II (tafʿīl) طَفَّفَ يُطَفِّفُ تَطْفِيْفًاṭaffafa yuṭaffifu taṭfīfan: to give short measure or weight; مُطَفِّفmuṭaffif pl. مُطَفِّفِيْنmuṭaffifīn (active participle, ism fāʿil) — and from this comes the name of the surah. The lexicographers' point: it was called taṭfīf because the thief steals only a very little, and that is precisely its gravity — that such a threat was pronounced over so petty a theft. Only once in the Quran: ﴿وَيْلٌ لِّلْمُطَفِّفِيْنَ﴾ (Al-Muṭaffifīn 83:1).