To pour juices or melted fat over (meat) during cooking in order to keep it moist. She basted the turkey every half hour to ensure it stayed juicy.
To sew with long, loose stitches in order to temporarily hold pieces of fabric together. Before sewing the final seam, she basted the fabric to check the fit.
To hit or beat (someone) vigorously; to thrash or scold harshly, especially as punishment. If you don't behave, I'll baste you within an inch of your life.