American English words have stress on the first syllable and British people stress the second one. Secondly, this is a pronunciation of such affixes as -ary, -ery, -ory, -mony, -ative, -bury, -berry.
The American English sound actually could be analyzed as a rhotic vowel phoneme /ɑ˞/, although I usually see it transcribed as a vowel-consonant sequence. There is also a fairly small, heterogeneous class of words where /ɑ(ː)/ occurs in both British English and American English without a following /r/ sound.
The word “chips” also causes problems because in American it means “crisps” (Lays, Pringles, etc.), where in British English it means “French fries” (the ones you get at MacDonalds). In other cases, the languages have different terms for the same thing. Here are some common examples (Brit vs. Amer): Shop vs. Store.
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