Crossword puzzle clue "allowing passage in and out"

Allowing passage in and out

Passage of passage?

Expand the intrapleural space, automatically allowing entry through the pharynx and beyond, then allow the diaphragm to relax, contract, and expel contents

Allowing for pets' comings and goings, maybe

Kind of splint that immobilizes the wrist and thumb while allowing movement of other fingers

Street allowing entry to local businesses

One not allowing a volley

Allowing no returns, in tennis