Other forms: bobbins
A bobbin is a small spool that thread is wound on. Wind the bobbin, a full bobbin, the bobbin ran out.
In a sewing machine there are two threads: the top one from the reel and the bottom one from the bobbin, and they lock together in the fabric. When the stitching goes wrong it is usually the bobbin tension, and threading it correctly is half the battle.
1nounbobbinA small spool that thread is wound on.
“She wound some red thread onto the bobbin before she began sewing.”
bobbin is a spool.
French bobine names the spool, of uncertain further origin.
French
bobine
English, today
bobbin
Borrowed from French bobine, recorded in English since 1530.
Etymology from Wiktionary, CC BY-SA