astray

Concise Oxford English Dictionary © 2008 Oxford University Press:
astray/əˈstreɪ/

▶adverb away from the correct path or direction.

– phrases
go astray become lost or mislaid.

– origin ME: from an Anglo-Norman Fr. var. of OFr. estraie, past part. of estraier, based on L. extra ‘out of bounds’ + vagari ‘wander’.