fail
UK: feɪl | US: feɪl
vi. to be unsuccessful in achieving a goal or standard
vt. to neglect or be unable to perform a duty or expectation
n. an instance of failing or falling short
The word "fail" traces back to the Latin fallere, meaning "to deceive, disappoint, or escape notice." It entered English via Old French faillir, retaining the core idea of falling short or lacking success. Over time, its meaning narrowed to focus on inadequacy in performance or expectation, shedding some of its original deceitful connotations. The simplicity of its structure (no clear prefix/root/suffix division) reflects its ancient, unbroken lineage.
Without practice, you may fail the driving test.
The engine failed during the storm, leaving the ship adrift.
His promise to arrive on time proved to be a fail.
If the system fails, backup generators will activate.
She never fails to impress her audience with innovative ideas.