The Collaborative International Dictionary
Greaving
Greave \Greave\, v. t. [imp. & p. p. Greaved (gr[=e]vd); p. pr. & vb. n. Greaving.] [From Greaves.] (Naut.) To clean (a ship's bottom); to grave.
Wiktionary
greaving
vb. (present participle of greave English)