
mitgehen
to go along
To accompany someone on foot; to go together with others to a specific place.
Ich gehe kurz zum Supermarkt, willst du mitgehen?
I'm just going to the supermarket, do you want to go along?
to go along
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to go along
To accompany someone on foot; to go together with others to a specific place.
Ich gehe kurz zum Supermarkt, willst du mitgehen?
I'm just going to the supermarket, do you want to go along?

to make off with
(Colloquial) To steal something or take it unnoticed. The expression is often used to downplay a theft.
An der Garderobe hat jemand meinen Schal mitgehen lassen.
Someone made off with my scarf at the coat check.

to go along with
(Figurative) To agree with an opinion, proposal, or development and support it.
Bei diesem Vorschlag kann ich voll und ganz mitgehen, er ist gut durchdacht.
I can fully go along with this proposal; it's well thought out.
'Mitgehen' (to go along) is a separable verb. The prefix 'mit-' separates from the verb in the main clause and comes at the end of the sentence. In subordinate clauses, the verb stays together.
Gehst du später mit ins Café?
Are you going along to the café later?
Since 'mitgehen' (to go along) expresses movement, the perfect tense is always formed with the auxiliary verb 'sein'. So say 'ich bin mitgegangen' (I went along), not 'ich habe mitgegangen'.
Er ist gestern Abend mit seinen Freunden ins Kino mitgegangen.
He went along to the cinema with his friends yesterday evening.
The expression 'etwas mitgehen lassen' (to make off with something) is a fixed unit and means 'stehlen' (to steal). It is used colloquially and has the structure: subject + hat + object (accusative) + mitgehen lassen.
Ich glaube, jemand hat meinen Stift mitgehen lassen.
I think someone made off with my pen.
You can recognize the figurative meaning 'zustimmen' (to agree) by the fact that the verb refers to something abstract, such as a proposal, an idea, or an argument. The literal meaning refers to a physical path or place.
Das ist ein guter Plan, da kann ich mitgehen.
That's a good plan; I can go along with that.
to support
With a proposal, unterstützen and mitgehen can both express agreement. Mitgehen emphasizes that you accept the content yourself and follow its direction. Unterstützen can additionally mean actively advocating for the proposal and helping move its implementation forward.

Die Abgeordnete kann den Vorschlag nach der inhaltlichen Änderung mitgehen.
The member of parliament can go along with the proposal after the changes to its content.
Die Abgeordnete unterstützt den Vorschlag und wirbt öffentlich dafür.
The member of parliament supports the proposal and publicly campaigns for it.