BACKBREAKING
\bˈakbɹe͡ɪkɪŋ], \bˈakbɹeɪkɪŋ], \b_ˈa_k_b_ɹ_eɪ_k_ɪ_ŋ]\
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characterized by toilsome effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"
By Princeton University