
erwischen
to catch
To catch someone in the act of doing something forbidden or secret, or to apprehend them.
Die Lehrerin hat den Schüler beim Spicken erwischt.
The teacher caught the student cheating.
to catch
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to catch
To catch someone in the act of doing something forbidden or secret, or to apprehend them.
Die Lehrerin hat den Schüler beim Spicken erwischt.
The teacher caught the student cheating.

to catch
To reach or catch something or someone just in time before it is too late.
Wenn wir uns beeilen, erwischen wir vielleicht noch den letzten Bus.
If we hurry, we might still catch the last bus.

to catch
Colloquial for getting an illness.
Ich glaube, ich habe mir eine Erkältung erwischt.
I think I've caught a cold.

to get caught
To be hit or affected by something negative, for example by a ball, bad weather, or an unfortunate circumstance.
Wir wurden auf dem Rückweg vom Gewitter voll erwischt.
We got completely caught in the thunderstorm on the way back.
The verb 'erwischen' (to catch) has a rather colloquial character in all of its meanings. It is used more often in spoken language than in formal written texts.
Ich habe ihn gerade noch erwischt, bevor er zur Tür hinausging.
I caught him just before he went out the door.
When you catch someone doing something forbidden, you use the preposition 'bei' followed by a noun in the dative. Often a verb is nominalized in this construction.
Meine Mutter hat mich beim heimlichen Naschen erwischt.
My mother caught me secretly snacking.
A very common idiom is 'jemanden auf frischer Tat erwischen' (to catch someone red-handed). It means that you catch a person at the exact moment when they are doing something forbidden.
Die Polizei hat den Einbrecher auf frischer Tat erwischt.
The police caught the burglar red-handed.
In the meaning 'rechtzeitig erreichen' (to reach in time), 'erwischen' (to catch) is almost always used in connection with public transportation. Typical phrases are 'den Bus erwischen' (to catch the bus), 'den Zug erwischen' (to catch the train), or 'den Anschluss erwischen' (to make the connection).
Ich bin gerannt und habe den Zug in letzter Sekunde noch erwischt.
I ran and caught the train at the very last second.
The phrase 'eine Krankheit erwischen' (to catch an illness) is typical of everyday spoken language. For example, you can say 'eine Erkältung' (a cold), 'die Grippe' (the flu), or 'einen Virus erwischen' (to catch a virus).
Zieh dir eine Jacke an, damit du dir keine Erkältung erwischst.
Put on a jacket so you don't catch a cold.
to get / receive
When talking about an illness, both “bekommen” and “erwischen” can mean that someone becomes ill. “Bekommen” is neutral, while “erwischen” sounds more colloquial and often presents the illness as something unwelcome. For a factual statement, “bekommen” is the less marked choice.

Nach dem langen Flug erwischte mich eine Grippe.
I caught the flu after the long flight.
Nach dem langen Flug bekam ich eine Grippe.
I got the flu after the long flight.