| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| Celtic |
| Middle Irish | slacain | I beat | vb.1.sg | W7 LRC |
| English |
| Old English | ofslean, ofslōh, ofslōgon, ofslægen | to slay, destroy | vb.str.VI | LRC |
| Old English | sle(a)ht, sli(e)ht, slīet, slyht | stroke, striking, slaughter | n.masc | W7 ASD LRC |
| Old English | slēan, slōg, slōgon, slagen | to slay, smite, strike | vb.str | W7 ASD LRC |
| Old English | slecg | sledge | n.fem | W7 LRC |
| Middle English | slaughter | slaughter | n | W7 LRC |
| Middle English | slegge | sledge | n | W7 LRC |
| Middle English | sleight | sleight | n | W7 LRC |
| Middle English | slen | to slay | vb | W7 LRC |
| Middle English | sli | sly | adj | W7 LRC |
| English | onslaught | fierce attack | n | AHD W7 LRC |
| English | schlock | shoddy/inferior item | n | AHD LRC |
| English | slag | cinder, dross/scoria of metal | n | AHD W7 LRC |
| English | slaughter | act of killing | n | AHD W7 LRC |
| English | slay, slew, slain | to kill, put to death violently | vb.str | AHD W7 LRC |
| English | sledge | sledgehammer | n | AHD W7 LRC |
| English | sledgehammer | large heavy two-handed hammer | n | W7 LRC |
| English | sleight | deceitful craftiness | n | AHD W7 LRC |
| English | sly | shrewd, canny | adj | AHD W7 LRC |
| West Germanic |
| Old Frisian | slā | to slay, smite, strike | vb | ASD LRC |
| Old Frisian | slachte | (mortal) blow; stamp, coining | n | ASD LRC |
| Dutch | aanslag | onslaught | n | W7 LRC |
| Old Saxon | man-slahta | manslaughter | n.fem | ASD LRC |
| Old Saxon | slahan | to slay, smite, strike | vb | ASD LRC |
| Middle Low German | slagge | slag | n | W7 LRC |
| Old High German | slaga | sledge, hammer, mallet | n | ASD LRC |
| Old High German | slahan | to slay, smite, strike | vb | W7 LRC |
| Old High German | slahta | slaughter | n | ASD LRC |
| German | Anschlag | onslaught, assault | n.masc | LRC |
| German | Schlag | hit, blow | n.masc | LRC |
| German | schlagen | to hit, strike, smite | vb | LRC |
| North Germanic |
| Old Norse | slá | to slay, smite, strike | vb | LRC |
| Old Norse | slātra | to slaughter | vb | W7 LRC |
| Old Norse | sleggja | sledge | n | W7 LRC |
| Old Norse | sloeght | sleight | n | W7 LRC |
| Old Norse | sloegr | sly | adj | W7 LRC |
| Old Icelandic | sláttr | smiting, mowing; striking an instrument | n.masc | ICE LRC |
| Icelandic | slá | to slay, smite, strike | vb | ASD LRC |
| Icelandic | sleggja | sledge | n | ASD LRC |
| East Germanic |
| Gothic | af-slahan | to slay | vb | ASD LRC |
| Gothic | slahan | to slay, smite, strike | vb | ASD LRC |