A guest worker, especially one in Germany.
[German : Gast, guest (from Middle High German, from Old High German; see ghos-ti- in the Appendix of Indo-European roots) + Arbeiter, worker (from arbeiten, to work, from Arbeit, work, from Middle High German arebeit, from Old High German arabeit; see orbh- in the Appendix of Indo-European roots).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.