fido.
to trust, put confidence in
Meaning & usage
to trust, put confidence in
to rely upon
Where this word comes from
From Proto-Italic *feiðō, from Proto-Indo-European *bʰéydʰeti (“to trust”), from the root *bʰeydʰ-. The perfect participle fīsus has been connected to Ancient Greek πιστός (pistós), hinting at a derivation from Proto-Indo-European *bʰidʰtós, itself a *-tós adjective to the root *bʰeydʰ-. However, according to the linguist Ville Leppänen, Lachmann's law cannot account for the vowel-length of the Latin term, perhaps indicating that a generalized e-grade was later introduced into the pre-form. Cognate to fidēs (“faith”) and Proto-Germanic *bīdaną.
dative/ablative masculine/neuter singular of fīdus (“trustworthy; faithful”)
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.