§ 143. Comparison with other OG languages, especially Gothic and O Icel, has revealed certain instances of the loss of consonants in WG and Early OE.
Nasal sonorants were regularly lost before fricative consonants; in the process the preceding vowel was probably nasalised and lengthened. Cf.:
Gt fimf, O Icel fim, OHG fimf —OE fif (NE five)
Gt uns, OHG uns — OE ūs (NE us)
§ 144. Fricative consonants could be dropped between vowels and before some plosive consonants; these losses were accompanied by a compensatory lengthening of the preceding vowel or the fusion of the preceding and succeeding vowel into a diphthong, cf. OE sēon, which corresponds to Gt saihwan, OE slēan (NE slay), Gt slahan, G. schlagen, OE sæʒde and sǣde (NE said).
§ 145. We should also mention the loss of semi-vowels and consonants in unstressed final syllables. [j] was regularly dropped in suffixes after producing various changes in the root: palatal mutation of vowels, lengthening of consonants after short vowels. The loss of [w] is seen in some case forms of nouns: Nom, trēo, Dat. trēowe (NE tree); Norn, sǣ, Dat. sǣwe (NE sea), cf. Gt triwa, saiws.