<P> A few Siamese twins have variations, based on the usage of the phrase . One time - worn expression is time and time again: it is frequently shortened to time and again . A person who is covered in tar and feathers (noun) usually gets that way by the action of a mob that tars and feathers (verb) undesirable people . </P> <P> Similarly, some Siamese twins mean something different depending on the conjunction between the words . For example a give and take refers to two - way or mutual flexibility, whereas give or take means a numerical approximation . Another example: a person can do something whether it is right or wrong in contrast to knowing the difference between right and wrong; each word pair has a subtly differing meaning . </P> <P> The term Siamese twins originates with Chang and Eng Bunker, the conjoined twins from Siam . In the context of the English language, this word was first used and popularised by H.W. Fowler, a renowned lexicographer . </P> <P> The most common conjunctions used in a phrase that constitutes Siamese twins are and or or . </P>

Where does the term siamese twins come from