Is "perpetuate" used only for bad things that should have been stopped? My dictionaries all say so, like to perpetuate divisions in society. But I just saw this sentence: In its earliest form, genius was concerned with the ability of the head of the family, the paterfamilis, to perpetuate himself. Also in a genetics textbook I've seen that perpetuate is used for continueing to breed or grow pure lines.

What does "domain" mean in this sentence? Looking after the house was once viewed as a woman's domain. Does it indicate that women were thought to be good at it or to have the duty of doing it?

What word do I use to refer to separate rooms/spaces of a train? car/carriage/coach/compartment?

How do I understand "in line with" in this sentence? “When looking at what would be in line with avoiding dangerous levels of climate change, we found that you could only stabilise the ratio of food-related emissions to all emissions if everyone adopted a plant-based diet,” Springmann says. “That scenario is not very realistic – but it highlights the importance that food-related emissions will play in the future.” Their finding is similar to avoiding dangerous levels of climate change? What does it mean?

Which expression below of hot weather is commonly used in daily life? 1.It's scorching. 2.Trees and grass are parched. 3.It's hot as the inferno. 4.It's hot as the apocalypse. 5.It's smotheringly hot. 6.One could fry eggs on the sidewalk. 7.It is like being put into a hot oven. 8.The sun is blazing today. 9.It's so hot that steam rises up from the tarred streets. 10.The black top is almost smoking. 11.The sun's rays feel like a million hot needles. 12.Things are wavy. Thanks in advance!

What does 'sound' mean in 'make a sound profit'? I came across it from the credo of a business company: ... Our final responsibility is to our stockholders. Business must make a sound profit. We must experiment with new ideas. Research must be carried on, ... Does sound mean having continual growth? Or reasonable and fair?

What's the difference between humour and wit? Could you give me examples of each please?

Confused with an example of 'lighthearted' from vocabulary.com 'When you are shopping for greeting cards, the lighthearted ones are the ones with the corny jokes, not the ones with pictures of dramatic sunsets.' Corny jokes are silly and probably make you groan every single time. Then why greeting cards with corny jokes are 'lighthearted', in other words, joyful and amusing?

What does 'arbitrary' mean? The dictionary defines it as 'based on random choice or personal whim, rather than any reason or system', like 'an arbitrary decision'. Is 'arbitrary' both subjective and random? How is it different from subjective or random?