1. the ingredients or accompaniments that go with a main dish
Usage: informal; often used in American English
2. small parts, screws, or hardware needed to assemble or attach something
Usage: informal

Examples

• We’re having turkey with all the fixings for Thanksgiving.
• The roast beef came with mashed potatoes and other fixings.
• I bought the shelf but forgot to get the fixings to mount it.
• The kit includes all the fixings you need for assembly.
• She prepared a feast with all the traditional fixings.
• Make sure you have the right fixings before starting the project.