満員
まんいん · manin · JLPT N2 · noun
full house
🏨 満員 = 満 (full) + 員 (member/person): a hotel with every room full, so no vacancy
満 means full and 員 means person or staff, so 満員 is a full crowd or a room full of people. 'Man-in' sounds like 'man in', a full house with someone in every seat.