1) an apparatus for blowing or forcing air into something e.g. a fire, an organ in a church (bellows)

2) to come or go into something (enter)

3) (to cause business companies) to become one unit; to fade or change gradually into something (merge)

4) a metal or plastic point at the end of a shoelace, string etc; a label (showing size, a price, an address etc) fastened to or stuck into something (tag)