The prefix "er-" seems to be very confusing, but there's actually a common underlying theme. Today, we'll find out what that is and check out examples.
The core idea of this root was:
laying, lying down
of course the verbs to lay and to lie belong here, but the root is also the origin of law, lair, ledger, allay and low. And of lager, which is essentially a German word that means storage.