How is 床 related to 临床 and 东床? 床 is bed, on which people sleep or lie.
But 临床 has the connection with medical profession and 东床 seems to be in relation to in-laws, but why is so? Because these two do not have any express features of sleeping or work which needs to be done in bed.
The term '临床' means &quot;in front of the patient's bed or operation bed &quot;


'临' (facing/ in front of)

'床' ( bed) here refers to '手术床'(operation bed) or 病床 (patient's bed)

'临床经验' means 'clinical experience'



The term '东床' came from the idiom 东床快婿,

The story of 东床快婿:

郄鉴 heard the sons of 王导 were all handsome gentleman. So, he wanted to marry his daughter to one of them. For that very reason, 郄鉴 sent a messenger to 王导's house to observe the young men in 王导's household in order to select one of them to be his son-in-law.
The messenger reported to 郄鉴 that all of them were pleasant gentleman and showed him great respect -- except for one.  There was one bare-chested young man lay there in a bed on the east side of the room,  ignoring all the commotion. 郄鉴 decided this bare-chested young man on the East-side bed was the finest young man among 王导's sons, and should be the husband of his daughter.
That bare-chested man on the East bed turned out to be the famous 王羲之 (Wang Xizhi).

That's the story of how '东床' (East bed) became a symbol of &quot;worthy son-in-law&quot;

in '东床快婿', '东床'(East bed)= '快婿'( a pleasant son-in-law)