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back nine
back nine n. 
/ˈbak ˌnʌɪn/, /ˈbæk ˌnaɪn/ Golf the final nine holes on an eighteen-hole course; the second half of an eighteen-hole round.
Brit. /ˌbak ˈnʌɪn/
, /ˌbak ˈnʌɪn//ˈbak ˌnʌɪn/U.S. /ˌbæk ˈnaɪn/
, /ˌbæk ˈnaɪn//ˈbæk ˌnaɪn/ΚΠ
1922 San Antonio (Texas) Evening News 9 Nov. 11/1 Tom Lally..held the old course with a 67, but that was before the ‘back nine’ had been changed.
1965 Irish Times 28 Apr. 3/4 Kinsella..failed to qualify because his back nine was inferior to that of the eight other players.
2004 S. Shmanske Golfonomics xiii. 287 A spectacular flub somewhere on the back nine may stand out foremost in the golfer's memory.
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