pull back

definition: make a retreat from an earlier commitment or activity
example:
speech part: verb
synonyms: retreat
definition: stretch back a bowstring on an archer's bow
example: I pulled back and let the arrow fly.
speech part: verb
synonyms: draw
definition: move to a rearward position
example:
speech part: verb
synonyms:
definition: use a surgical instrument to hold open (the edges of a wound or an organ)
example:
speech part: verb
synonyms: retract
definition: pull back or move away or backward
example:
speech part: verb
synonyms: retreat

How pull back is being used?