move (a door or window) so as to leave a space allowing access and vision

she opened the door and went in

‘Open up!’ he said

unfold or be unfolded; spread out

the eagle opened its wings and circled up into the air

the tail looks like a fan when it is opened out fully

the flowers only open during bright weather

make formally ready for customers, visitors, or business

she raised £731 by opening her home and selling coffee and tea

formally establish or begin (a new business or enterprise)

she began to teach and opened her own school

we opened up a branch in Madrid

make (something) present, available, or accessible

a civil war there has opened the possibility of a peace treaty with the Federation

(of a piece of writing or music) begin

the chapter opens with a discussion of Anglo-Irish relations

break the conducting path of (an electric circuit)

the switch opens the motor circuit

outdoors, especially in an exposed or unprotected setting

guests were sitting in the open on the terrace

a championship or competition with no restrictions on who may compete

his victory in the 2003 Australian Open

an accidental break in the conducting path for an electric current