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S. #achar-, v. “to avenge, do back, react, requite” derived from the Sindarin-only root √AK “hostile return,” probably in combination with ✶kar- “to do.”

Present 1st: Sg. 2nd: Sg. Fam. 2nd: Sg. Form. 3rd: Sg. 1st: Pl. Inc. 1st: Pl. Exc. 2nd: Pl. Form. 3rd: Pl.
English I You You He/She/It We (and you) We (but not you) Y'all They
Sindarin echerin echerig echeril achar echerib echerif echeridh echerir
Past 1st: Sg. 2nd: Sg. Fam. 2nd: Sg. Form. 3rd: Sg. 1st: Pl. Inc. 1st: Pl. Exc. 2nd: Pl. Form. 3rd: Pl.
English I You You He/She/It We (and you) We (but not you) Y'all They
Sindarin achóren achóreg achórel achor achóreb achóreb achóredh achórer
Future 1st: Sg. 2nd: Sg. Fam. 2nd: Sg. Form. 3rd: Sg. 1st: Pl. Inc. 1st: Pl. Exc. 2nd: Pl. Form. 3rd: Pl.
English I You You He/She/It We (and you) We (but not you) Y'all They
Sindarin acharathon acharathog acharathol acharatha acharathab acharathof acharathodh acharathar
Present Active Participle Past Active Participle Passive Past Participle (Singular) Passive Past Participle (Plural)
acharol echóriel acharnen echernin
Imperative Infinitive Gerund
acharo achared achared

Examples of avenge in a Sentence: