freestyle
n//fɹiˌstaɪəl//frisim, brösta, extemporera, fjädra, frilira, frirälsa, fristila
(swimming) A swimming event in which the contestants may choose any stroke.
(swimming, by extension) The swimming stroke commonly referred to as the front crawl or the Australian crawl.
(intransitive, especially in rap music) To improvise one's own style; to ad-lib.