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under-the-hood stresses
avia.	с применением шторок (An expression indicating that the pilot is using a hood to restrict visibility outside the cockpit while simulating instrument flight. An instrument-rated pilot is required in the other control seat while this operation is being conducted Alexander Demidov)
inf.	начинка (jimka)
tech.	"внутренности" (jimka)
under the hood
idiom.	за кулисами (Alex_Odeychuk)
inf.	движок (двигатель у автомобиля a car or truck engine); под капотом (MasterK)
progr.	так сказать за кадром (Alex_Odeychuk); с точки зрения внутреннего устройства (англ. термин взят из кн.: De Sanctis V. ASP.NET Core and Angular 2 Alex_Odeychuk); с точки зрения внутренней структуры (из кн.: Лафоре Р. Объектно-ориентированное программирование в C++ Alex_Odeychuk); что называется за кадром (Alex_Odeychuk)
English thesaurus
under the hood
avia., Canada	An expression indicating that the pilot is using a hood to restrict visibility outside the cockpit while simulating instrument flight. An instrument-rated pilot is required in the other control seat while this operation is being conducted.

under-the-hood: 12 phrases in 7 subjects

Automobiles	1
Aviation medicine	2
General	3
Idiomatic	1
Informal	2
Programming	2
Technology	1