Indo-European etymology :

Proto-IE: *eus-

Nostratic etymology:

Meaning: to burn (tr.)

Old Indian: oṣati `to burn', ptc. uṣṭa-, uṣṇá- `hot, warm'

Old Greek: héu̯ō, aor. hêu̯sai̯ `sengen'; héu̯strǟ f. `Senggrube'

Baltic: ? *usn-i- c., *usn-ā̂ f., usn-iā̃ f., *ūsn-iā̃ f., *usn-jā̂ f.

Germanic: *ús-l-ō(n-) f., -an- m.; *ús-jōn- f., *aim-uz-jōn- f., *uz-n-ṓ- vb., *úsV-l-an- m.

Latin: ūrō, -ere, ussī, ustus tr. `brennen, verbrennen, ausdörren'

Russ. meaning: жечь

References: WP I 111 f