noun

• (rare) That which stops up or fills a gap or hole.
  "[A] bit of ink and paper which has long been an innocent wrapping or stop-gap may at last be laid open under the one pair of eyes which have knowledge enough to turn it into the opening of a catastrophe."
• (figuratively)
• (figuratively)
  "The small company used their old product with a few kludged enhancements as a stopgap until they could develop a new product."
• (figuratively)
  "As witness the following. Mr Strudwick, the regular master of the form, happened on one occasion to be away for a couple of days, and a stop-gap was put in in his place. The name of the stop-gap was Mr Somerville Smith. He and Farnie exchanged an unspoken declaration of war almost immediately."

verb

• (transitive) To stop up or fill (a physical gap or hole, or a hiatus).
• (intransitive) To use something as a short-term fix or temporary measure until a better alternative can be obtained.
• (intransitive) To use something as a short-term fix or temporary measure until a better alternative can be obtained.