The flanks of a fold are known as the limbs.
ð ə WORD_BOUNDARY f l æ ŋ k s WORD_BOUNDARY ə v ə WORD_BOUNDARY f oʊ l d WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY n oʊ n WORD_BOUNDARY æ z WORD_BOUNDARY ð ə WORD_BOUNDARY l ɪ m z WORD_BOUNDARY