
fehlschlagen
to fail
To not have the desired success; to fail or go wrong. Often used for plans, attempts, or projects.
Der Versuch, den Weltrekord zu brechen, ist leider fehlgeschlagen.
The attempt to break the world record unfortunately failed.
to fail
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to fail
To not have the desired success; to fail or go wrong. Often used for plans, attempts, or projects.
Der Versuch, den Weltrekord zu brechen, ist leider fehlgeschlagen.
The attempt to break the world record unfortunately failed.
'Fehlschlagen' (to fail) is a separable verb. The prefix 'fehl-' comes at the end of a main clause, while in a subordinate clause it stays attached to the verb.
Unser Plan schlug leider fehl.
Unfortunately, our plan failed.
The perfect tense of 'fehlschlagen' (to fail) is always formed with the auxiliary verb 'sein' (to be), because it describes a change of state (from success to failure).
Das Experiment ist fehlgeschlagen.
The experiment failed.
This verb is typically used for abstract things. Common subjects are: a plan, a project, a mission, an attack, or an experiment.
Die Mission, den Satelliten zu reparieren, ist fehlgeschlagen.
The mission to repair the satellite failed.
to fail
For an unsuccessful undertaking, scheitern and fehlschlagen are often both possible. Scheitern presents the undertaking or the person involved as unsuccessful, while fehlschlagen emphasizes that a measure did not achieve the desired success. Use scheitern for the undertaking and fehlschlagen for its result.

Der neue Sanierungsplan schlug wegen der hohen Kosten fehl.
The new renovation plan failed because of the high costs.
Der neue Sanierungsplan scheiterte an den hohen Kosten.
The new renovation plan failed because of the high costs.