Verb back out has 2 senses
  1. back out - move out of a space backwards; "He backed out of the driveway"
    --1 is one way to
    back
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
  2. retreat, pull back, back out, back away, crawfish, crawfish out, pull in one's horns, withdraw - make a retreat from an earlier commitment or activity; "We'll have to crawfish out from meeting with him"; "He backed out of his earlier promise"; "The aggressive investment company pulled in its horns"
    Sample sentence:
    Somebody ----s
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