Meanings
Inseparable verbal prefix that indicates a successful conclusion, leads to the wanted result.
er- + wachsen (“to grow”) → erwachsen (“to arise”)
Inseparable verbal prefix that indicates killing or dying.
er- + drücken (“to push, squeeze”) → erdrücken (“to squeeze dead”)
Inseparable verbal prefix that indicates getting something by some means, usually through conscious effort.
er- + arbeiten (“to work”) → erarbeiten (“to gain something by means of working for it”)