cause to open or to become open; "Mary opened the car door" (同)open_up
make available; "This opens up new possibilities" (同)open_up
start to operate or function or cause to start operating or functioning; "open a business" (同)open_up
not sealed or having been unsealed; "the letter was already open"; "the opened package lay on the table" (同)opened
used of mouth or eyes; "keep your eyes open"; "his mouth slightly opened" (同)opened
not brought to a conclusion; subject to further thought; "an open question"; "our position on this bill is still undecided"; "our lawsuit is still undetermined" (同)undecided, undetermined, unresolved
affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open" (同)unfastened
(set theory) of an interval that contains neither of its endpoints
accessible to all; "open season"; "an open economy"
affording free passage or access; "open drains"; "the road is open to traffic"; "open ranks"
begin or set in action, of meetings, speeches, recitals, etc.; "He opened the meeting with a long speech"
display the contents of a file or start an application as on a computer
have an opening or passage or outlet; "The bedrooms open into the hall"
having no protecting cover or enclosure; "an open boat"; "an open fire"; "open sports cars"
make the opening move; "Kasparov opened with a standard opening"
not having been filled; "the job is still open"
not requiring union membership; "an open shop employs nonunion workers"
open to or in view of all; "an open protest"; "an open letter to the editor"