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.
pants / trousers
'in die Hose gehen' and 'fehlschlagen' can both mean that something is not successful. 'in die Hose gehen' is colloquial and works well in everyday conversations. It sounds direct and somewhat casual. 'fehlschlagen' is more factual and is often used for plans, attempts, or projects. It sounds a bit more formal than 'in die Hose gehen'. When speaking with friends, the expression is natural. When reporting neutrally about an attempt or a project, 'fehlschlagen' fits better.
Der Versuch ist trotz guter Vorbereitung fehlgeschlagen.
The attempt failed despite good preparation.
Wenn wir zu spät losfahren, geht unser Plan sicher in die Hose.
If we leave too late, our plan is sure to go wrong.