to handle / avoid / circulate
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to deal with
The way one treats someone or something or copes with a situation. This verb is separable (e.g., 'er geht damit um' — he deals with it).
Er kann gut mit schwierigen Kunden umgehen.
He can deal well with difficult customers.
This verb is difficult because it is separable or inseparable depending on the meaning. Separable ('mit etwas umgehen' — to deal with something) means 'to handle'. Inseparable ('etwas umgehen' — to avoid something) means 'to avoid' or 'to bypass'.
Sie geht professionell mit der Kritik um.
She deals with the criticism professionally.
In the meaning 'to handle', the verb is separable and needs the preposition 'mit' followed by the dative. In a main clause, the prefix 'um' goes at the end.
Wie gehst du mit so viel Stress um?
How do you deal with so much stress?
In the meaning 'to avoid', the verb is inseparable and needs an accusative object. The prefix 'um-' is not separated from the verb.
Manche Firmen versuchen, die Steuern zu umgehen.
Some companies try to avoid taxes.
In the meaning 'to spread', the verb is separable. The subject is often impersonal, such as 'ein Gerücht' (a rumor) or 'die Angst' (fear). A typical form is 'es geht ... um' (there is ... going around).
Im Dorf geht die Angst vor dem Wolf um.
Fear of the wolf is going around in the village.
to treat / to deal with
'behandeln' and 'umgehen mit' can both describe how you behave toward a person, thing, or situation. 'behandeln' focuses more on the way someone treats a person or thing, for example kindly, badly, or carefully. 'umgehen mit' is especially suitable when it is about how you manage a situation or how you use or cope with something. Learners may confuse the words because in some sentences you can say both. Often more natural is: you 'behandelt' people well or badly; you 'geht um' with problems, criticism, or devices.
Nach dem Gespräch ist Anna besser mit der Kritik umgegangen.
After the conversation, Anna dealt with the criticism better.
Der Chef behandelt alle Mitarbeitenden mit Respekt.
The boss treats all employees with respect.