Épreindre belong to the 3rd group.
Épreindre is conjugated the same way that verbs that end in : -ndre
Épreindre is conjugated with auxiliary avoir.
Épreindre verb is
direct transitive. Épreindre verb is a direct transitive verb, so passive voice can be used.
Épreindre is a french third group verb. So, this verb is irregular and do not follow a regular conjugation pattern like first or second group verbs. Follow this link to see all the endings of the conjugation of most of the third group verbs : conjugation rules and endings for the second group verbs.
ÉPREINDRE : v. tr. Serrer, presser quelque chose pour en tirer le suc, pour en exprimer le jus. Épreindre des herbes. Épreindre du verjus. Par extension, il signifie Faire sortir en pressant. Épreignez-en le suc.