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/ʌndəˈweɪ/ (say unduh'way)

adjective 1.  in progress: *A land, sea and air search is underway. –abc online, 2003.

phrase 2. get underway, to begin.

Usage: The phrase under way (see under def. 32) has such high frequency that it increasingly appears as one word, as above. Some people, however, may still consider this to be incorrect.