Meanings

movable bridge

opening ceremony

opening a book

switch

unbuttoning a collar

opening or unsealing of bids

open economy

spreading the legs (wide apart)

making an incision in the abdomen

being open but having virtually no business

making materials in a library available in open stacks

mechanical device for opening and closing (shutters, gates, etc.)

opening day

unsealed mail

ballot-counting place

laparotomy (abdominal surgery)

slicing a fish down its back

Freedom of Information Act

deployment

opening a new hospital, institution, temple, etc.