(idiomatic) To allow some action to proceed more swiftly or to a greater extent

(programming) An operator that returns the length of a string in bytes, characters, or code points, or the number of consecutive numerically indexed values in a table or array.

Alternative form of open the kimono

(historical, of garments) Having wide legs and reaching below the knees but higher than the ankles (not tied or closed at the knees).

(historical, plural in form) Wide-legged breeches ending below the knee.

present participle of open up

(idiomatic) A redundant activity.

plural of open-air museum

Having one's arms open and apart / (idiomatic) cordial; friendly; welcoming

The first night, evening, or day, of a spectacle or show. / The first event in a new venue.