What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
Definition of lebensspur in English:
lebensspur
noun
Biology GeologyA track, burrow, cast, etc., left in sediment by a living organism; especially such a trace preserved in fossil form in sedimentary rock.
Origin
1950s; earliest use found in Micropaleontology. From German Lebensspur indirect evidence of life.
