Synonyms of 'stopgap'
a thing that serves as a substitute for a short time until replaced by something more suitableIt is not an acceptable long term solution, just a stopgap.
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in the sense of substitute
a person or thing that takes the place of another, such as a player who takes the place of a team-mate
She is seeking a substitute while her secretary is on leave.
Thesaurus for stopgap from the Collins English Thesaurus