‘履行’ is a formal, written verb meaning 'to carry out' or 'to fulfill' — especially duties, responsibilities, promises, contracts, or obligations. It combines two characters: 履 (lǚ), which originally meant 'to tread' or 'to step on', implying action and engagement; and 行 (xíng), meaning 'to go' or 'to act'. Together, they convey the idea of actively stepping forward to perform something required or promised. The word carries a sense of seriousness and accountability.

It’s commonly used in official, legal, academic, or professional contexts — such as fulfilling a contract (履行合同), carrying out a duty (履行职责), or honoring a commitment (履行诺言). While occasionally heard in speech, it’s far more frequent in formal writing than in casual conversation. Learners should avoid using it for everyday actions like 'doing homework' or 'keeping an appointment' — simpler verbs like 完成 or 遵守 are more appropriate there.