Note that, in the passages below, the emboldened and same-coloured parts of words listed immediately after the phrase ‘Pronunciation tip’, are pronounced in the same way. For example, ‘Pronunciation tip: uncouth, mood’ means the ‘ou‘ in the word ‘uncouth’ sounds just like the ‘oo’ in the word ‘mood’.
uncouth
‘Uncouth’ means ‘lacking taste, refinement or cultivation‘.
Pronunciation tip: uncouth, mood.
underpin
The word ‘underpin’ has two meanings.
One of its meanings is ‘back up with authority or evidence, or make more certain or confirm‘.
The other meaning is ‘support from beneath‘.
upheaval
The word ‘upheaval’ has several meanings. One of its meanings is ‘violent disorder and disturbance, as in social or political conditions‘. You can learn about the other meanings from a good dictionary.