(transitive, intransitive) to open, be open (a door, lid, path, source code) / (transitive) to unfold, expand, open up / (transitive) to turn on, start up (a computer, light, fan) / (transitive) to open for business / (transitive) to launch, inaugurate (an investigation, conference, military campaign) / (transitive) to mark the beginning of (an era, situation)

to extend; to expand; to enlarge

to raise the curtain (to start a performance) / to begin; to start

to open one's heart

open; open-hearted; open-minded; friendly

(literally and figuratively) to open the door

to extend; to expand (one's knowledge, etc.)

to begin; to start

open; wide open; extensive

to open wide