German phrase
Ich schließe mich ~ an.
Meaning
I agree with ___
When to use it
Shows agreement with an idea. It can sound slightly formal among friends.
Example dialogue
Gute Idee, lass uns am Samstag wandern gehen.
Good idea, let's go hiking on Saturday.
Ich schließe mich deiner Idee an.
I agree with your idea.