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props
prop up the bar
To spend a large amount of time drinking at a pub or pubs in general. Primarily heard in UK. My father spent most of my childhood propping up the bar, so forgive me if I am not overly enthusiastic about social drinking. John's down at the local, propping up the bar with his mates from work.
knock the props out from under someone
Fig. to destroy someone's emotional, financial, or moral underpinnings; to destroy someone's confidence. When you told Sally that she was due to be fired, you really knocked the props out from under her.
give props to somebody
(slang) to express your respect for someone We would like to give props to all of the people who have contributed to the making of this website.
Etymology: props is a short form of proper respect (the respect someone deserves)
knock the bottom out of something
(informal) to harm something and make it weaker, especially by taking away the thing it needs in order to continue or be successful Ben losing his job has knocked the bottom out of our plans to buy a house.
knock the bottom out of
Also, knock the props out from under. Render invalid, undermine. For example, The discovery of another planet that might support life knocks the bottom out of many theories , or Jane's skilled debating knocked the props out from under her opponent. The first expression dates from the late 1800s, the variant from the first half of the 1900s.
props
n. evidence of respect; one’s proper respect. You gotta give me my props.