A quick look at "aufmachen" and why it doesn't only mean "to open". Also: a look at the secret behind the r-verion and the super useful "raufmachen".
The core idea of this root was:
And its main field of use originally was “kneading” clay to build a house.
The sense has broadened a lot in the verb to make, but the original sense is still visible in most of the other relatives.
- mass (originally: “unshaped lump of matter”)
- match (originally: “masses fitting well”)
- magma (originally: “thick dough like matter”)
- among (originally: “kneaded together”)