To fail to notice something, overlook it, or not become aware of it. It is often used with a dative object that indicates the person who does not notice something.
example
Mir ist völlig entgangen, dass heute dein Geburtstag ist.
I completely missed the fact that today is your birthday.
Usage tips
Inseparable verb
'Entgehen' (to escape / miss) is an inseparable verb because it begins with the prefix 'ent-'. The prefix remains attached to the verb in all conjugations and sentence forms.
EXAMPLE
Leider ist mir diese Information entgangen.
Unfortunately, I missed this information.
Always with dative
The verb 'entgehen' (to escape / miss) is always used with the dative. The person who does not notice something or escapes something is in the dative.
EXAMPLE
Dem aufmerksamen Detektiv entging kein Detail.
No detail escaped the attentive detective.
Typical sentence structure
When someone does not notice something, the impersonal structure 'Es ist [Dativ] entgangen, dass ...' (It escaped [dative person] that ...) is often used. What the person did not notice follows in a subordinate clause.
EXAMPLE
Es ist mir entgangen, dass du eine neue Frisur hast.
I missed the fact that you have a new hairstyle.
Fixed expression
The expression 'sich etwas entgehen lassen' (to miss out on something) is reflexive. The person is in the dative ('sich'), and the missed opportunity is in the accusative ('etwas').
EXAMPLE
Die Party war großartig, du hast dir wirklich etwas entgehen lassen!
The party was great; you really missed out!
Compare with
antonym
entgehen vs nutzen
to use / benefit
'nutzen' and 'sich etwas entgehen lassen' are opposites here. When you use or take advantage of an opportunity, you actively take it and make something of it. When you 'sich eine Gelegenheit entgehen lassen' (miss out on an opportunity), you miss it or do not take part in it, even though it would be good or interesting. The difference is especially clear with offers, chances, or nice experiences: 'nutzen' means to take part or act, while 'sich entgehen lassen' means to pass up or miss out on something.
entgehen
Morgen lassen wir uns das Konzert im Park nicht entgehen.
Tomorrow we won't miss the concert in the park.
nutzen
Nach dem Gespräch nutzt Anna das Angebot und meldet sich für den Kurs an.
After the conversation, Anna takes advantage of the offer and signs up for the course.