noun
a person who has responsibility for or looks after something
adjective
relating to the job or role of a custodian
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The custodian is responsible for maintaining the cleanliness of the school building.
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Hey, have you seen the custodian around? I need to ask them something.
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The custodian is the one who keeps this place looking spick and span.
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In a way, the custodian is like the guardian of the building, always watching over it and keeping it in order.