Discussion Groups / ESL Teaching / May 2006

1.b.

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Merriam-Webster's 11th Collegiate Dictionary

Main Entry: back
Function:adverb
Date:14th century

1 a : to, toward, or at the rear  b : in or into the past  : backward
in time;  also   : AGO  c : to or at an angle off the vertical  d (1) :
under restraint  (2) : in a delayed or retarded condition
2 a : to, toward, or in a place from which a person or thing came  b :
to or toward a former state  c : in return or reply