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Verb: fall open
  1. Open involuntarily
    "His mouth fell open";
    - drop open

Derived forms: falling open, fell open, fallen open, falls open

Type of: drop, drop down, sink

Nearest

fall for
fall from grace
fall guy
fall in
fall in line
fall in love
fall into
fall into place
Fall of Man
fall off
fall open
fall out
fall over
fall over backwards
fall short
fall short of
fall through
fall to pieces
fall under
fall upon
fall webworm