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in-ground
in-ground adj.
Brit. 
/ˌɪnˈɡraʊnd/
, /ˌɪnˈɡraʊnd/U.S. /ˌɪnˈɡraʊnd/
originally U.S. (of an outdoor swimming pool) built into the ground (as distinct from one placed above ground), esp. at a private residence./ˌɪnˈɡraʊnd/ΘΚΠ
society > leisure > sport > types of sport or game > water sports except racing > swimming > [adjective] > of outdoor swimming pool: built into ground
in-ground1959
1959 N.Y. Times 12 July x. 45/3 87 per cent of all residential in-ground pools built last year were made of concrete.
1977 Lancashire Life Mar. 114/2 (advt.) ‘Pool Services’..Distributors of Above and Inground Do-It-Yourself Pool Kits.
1988 J. Frame Carpathians ix. 62 We've in mind for later an in-ground swimming-pool.
2016 Dayton (Ohio) Daily News (Nexis) 11 Dec. r3 Patio doors open from the sun room to the private back yard with paver-brick patio and in-ground pool.
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