<span class="searchmatch">fossāvissem</span> first-person singular pluperfect active subjunctive of fossō...
fossāverīs fossāverit fossāverīmus fossāverītis fossāverint pluperfect <span class="searchmatch">fossāvissem</span> fossāvissēs fossāvisset fossāvissēmus fossāvissētis fossāvissent passive...