تَخَلّف: تَأخّر lag, retardation, falling behind, staying behind, remaining behind, dropping behind; lingering, tarrying; failure to

تَخَلّفٌ عَنِ الحُضُور nonattendance, nonappearance, absence, nonpresence, being away, staying away, remaining away, failure to attend or show up; truancy; absenteeism

تَخَلّفٌ عَنِ الدّفْع default, failure to pay on time, being in arrears

تَخَلّفٌ عَنِ المُثُول أمَامَ القَضَاء default, failure to appear in court

تَخَلّف (حَضَارِيّ إلخ): ضِدّ تَقَدّم أو تَطَوّر underdevelopment, retardation, backwardness

تَخَلّفٌ عَقْلِيّ amentia, mental retardation; feeble-mindedness, moronity, imbecility, idiocy