ob-sīgnō āvī, ātus, āre, to seal, seal up, attest under seal: totis castris testamenta obsignabantur, Cs.: quaestionem, i. e. witness: tabellis obsignatis agis mecum, i. e. you hold me strictly to my words: tabellas obsignare velle, seal up the documents, i. e. make an end of discussion: obsignandi gratiā venire, to put seals on (the papers and effects): contra Scaurum litteras, i. e. prefer a charge.

—To make fast, close safely: inane obsignari nihil solere.