Verb retrace has 2 senses
  1. trace, retrace - to go back over again; "we retraced the route we took last summer"; "trace your path"
    --1 is one way to return, go back, get back, come back
    Sample sentence:
    Somebody ----s something
  2. reconstruct, construct, retrace - reassemble mentally; "reconstruct the events of 20 years ago"
    --2 is one way to speculate, theorize, theorise, conjecture, hypothesize, hypothesise, hypothecate, suppose
    Sample sentences:
    Somebody ----s something
    Somebody ----s that CLAUSE
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