bed
noun/bɛd/ 
furniture
1 [countable, uncountable] a piece of furniture for sleeping ona single/double bedShe lay on the bed (= on top of the covers).He lay in bed (= under the covers).I'm tired—I'm going to bed.It's time for bed (= time to go to sleep).I'll just put the kids to bed.He likes to have a cup of cocoa before bed (= before going to bed).to get into/out of bedto make the bed (= arrange the covers in a tidy way)Could you give me a bed for the night (= somewhere to sleep)?There's a shortage of hospital beds (= not enough room for patients to be admitted).He has been confined to bed with flu for the past couple of days. see also sofa bed, twin bed, waterbed
of river/lake/sea
2 [countable] the bottom of a river, the ocean, etc.the ocean bedoyster beds (= an area in the ocean where there are many oysters)for flowers/vegetables
3 [countable] an area of ground in a yard or park for growing flowers, vegetables, etc.flower beds see also seedbedbottom layer
4 [countable] bed of something a layer of something that other things lie or rest ongrilled chicken, served on a bed of riceThe blocks should be laid on a bed of concrete.geology
5 [countable] a layer of clay, rock, etc. in the ground see also bedrock(not) a bed of roses
(not) an easy or a pleasant situation
Their life together hasn't exactly been a bed of roses.a bed of rosesnot a bed of rosesdie in your bed
to die because you are old or sick
die in your bedget up on the wrong side of the bed
to be in a bad mood for the whole day for no particular reason
get up on the wrong side of the bedgo to bed with someone
(informal) to have sex with someonego to bed within bed
used to refer to sexual activity
What's he like in bed?I caught them in bed together (= having sex).in bedtake to your bed
to go to bed and stay there because you are sick
take to your bed