How Do You Spell COSTEN?
Pronunciation: [kˈɒstən] (IPA) 
The word "costen" is spelled with a "t" instead of a "d" because it follows the spelling rules for adding the "en" suffix to a verb stem ending in a "t" or "te." In IPA phonetic transcription, the word is pronounced as "ˈkɒstən," with the stress on the first syllable and the "o" sound as in "hot." It means to incur an expense or pay a price, and is commonly used in British English.
