The Oxford Thesaurus An A-Z Dictionary of Synonyms - stopgap n.

1) makeshift, improvisation, substitute: The wire served as a stopgap until they could get the proper part. --adj. 2) makeshift, temporary, improvised, impromptu, substitute, emergency, provisional, stand-by; jury-rigged: A broomstick served as a stopgap mast for the dinghy's sail.