• to set up as, to set up for oneself, to set up in business
• to keep one's ears open
• to keep one's wits about one
• have the free run of the house
• have the free run of the house
• to open, to turn on, to unbar, to unclasp, to unclench, to unclinch, to unclog, to undo, undid, undone, to unfold, to unlatch, to unlock, to unsnap
• opening convocation, opening of the academic year