idg. teup „sich niederkauern, verbergen” >dt. Dieb, engl. thieve ;
The arrow ">" does not always mean an etymological derivation.
Sometimes it may be just a conjecture (even a refuted one), or an error.
Take the tree as a suggestion for lookup, e.g. try https://www.dwds.de/wb/Dieb#etymwb-1