Defaillir
Defaillir is a rarely used or historical variant spelling of the French verb défaillir. In contemporary French, the standard spelling is défaillir, and defaillir is largely confined to older texts or as a typographical variant. The verb has two main senses: to faint or lose consciousness, and to fail or falter in undertaking a task. For example, on the fainting sense one might say: il a défailli sous la fatigue. In the sense of failing to meet an obligation, one might speak of défaillir under pressure or to défaillir à tenir une promesse, though the latter is more literary.
Etymology and usage: Defaillir is formed from the prefix de- attached to faillir (to fail), itself from
Conjugation: Défaillir is a regular -ir verb with some irregularities typical of this class. Present tense forms