adjective [ only before noun ]
1.
large enough to walk into :
a walk-in closet
2.
not arranged in advance; where you do not need to arrange a time in advance :
a walk-in interview
a walk-in clinic
adjective [ only before noun ]
1.
large enough to walk into :
a walk-in closet
2.
not arranged in advance; where you do not need to arrange a time in advance :
a walk-in interview
a walk-in clinic
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005