nip and tuck /ˌnɪpən(d)ˈtʌk/
  不分勝負,不相上下,並駕齊驅
  Nip, n.
  1. A seizing or closing in upon; a pinching; as, in the northern seas, the nip of masses of ice.
  2. A pinch with the nails or teeth.
  3. A small cut, or a cutting off the end.
  4. A blast; a killing of the ends of plants by frost.
  5. A biting sarcasm; a taunt.
  6. Naut. A short turn in a rope.
  Nip and tuck, a phrase signifying equality in a contest; as, it was nip and tuck right to the last minute of play. [Low, U.S.]
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  nip and tuck
       adj : inconclusive as to outcome; close or just even in a race or
             comparison or competition; "as they approached the
             finish line they were neck and neck"; "the election was
             a nip and tuck affair" [syn: neck and neck, head-to-head]
       n : plastic surgery to remove wrinkles and other signs of aging
           from your face; an incision is made near the hair line
           and skin is pulled back and excess tissue is excised;
           "some actresses have more than one face lift" [syn: face
           lift, facelift, lift, face lifting, cosmetic
           surgery, rhytidectomy, rhytidoplasty]
       adv : even or close in a race or competition or comparison; "the
             horses ran neck and neck"; "he won nip and tuck" [syn:
             neck and neck, head-to-head]