From Longman Dictionary of Contemporary Englishwalk-inˈwalk-in adjective [only before noun] 1 DHbig enough for a person to walk inside a walk-in closet2 → walk-in business/clinic/centre etc
Examples from the Corpus
walk-in• The walk-in centre is the result of two years' struggle by an international group of scientists to realise an ideal.• Mini-suites offer a sitting area, tub and shower and a walk-in closet.• She clumped across the star-patterned mosaic towards the walk-in cupboard where the ski-gear was kept.• She also said she was locked in a walk-in freezer by two male workers.• It was a Soviet-built apartment with a walk-in wardrobe and red velvet curtains partitioning rooms. 