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butter up (informal) to be nice to or praise in the hope of gaining something from the person.
buttock (usually plural) the rounded, fleshy part of the human body behind the hips; rear end.
button a small round flat disk that fastens clothing by fitting through a slit or loop. [5 definitions]
buttonhole a small slit in a piece of clothing through which a button can be fastened. [2 definitions]
buttress a structure built to give support to the outside of a building or a wall. [2 definitions]
buy to get in return for paying money; purchase. [3 definitions]
buzz a soft, low hum. [4 definitions]
buzzard a very large bird with a hooked bill and sharp claws; American vulture.
buzzer an electrical device that signals by buzzing.
by next to; near. [10 definitions]
by and by before long; soon.
by and large in general; mostly.
by degrees by steps or stages; gradually.
by far without a doubt; indeed.
bygone gone by; former; past.
by heart by memory.
by hook in any possible way, using any possible means.
by leaps and bounds very quickly.
bypass a road that is built to go around a busy area or to avoid something in the way. [2 definitions]
by-product some thing or result that comes from an action intended for some other purpose.
bystander someone who happens to be present when something takes place but does not take part in it.