The primary attendant to the groom in a wedding ceremony.

(idiomatic) A person's finest clothing, especially the clothes one reserves to wear to church on Sunday.

Any product thought to be the best of its type.

(film production) The first assistant to either the key grip (in charge of camera placement and movement) or the gaffer (in charge of lighting and electrics).

plural of best boy

(marketing) Highly popular with consumers purchasing goods within a specific class.

Used other than figuratively or idiomatically: see best, friend. / An especially close and trusted friend. / (informal) An object or concept considered very useful or helpful.

(idiomatic) The best or most preferred person or item within a group.

superlative form of well off: most well off

superlative form of well-off: most well-off / Alternative spelling of best off