Akademik

суть
жен. essence, core, main point, gist суть вопроса/проблемы ≈ the crux/kernel/heart of the problem по сути дела ≈ at bottom of fact, as a matter of fact, in point of fact дойти до сути ≈ to come to the point, to touch the ground
сут|ь - ж. essence, substance;
gist;
~ дела the gist of the matter;
дойти до ~и come* to the point;
добраться до ~и дела get* at the root of things, get* down to bedrock;
по ~и дела in reality;
as a matter of fact.

Большой англо-русский и русско-английский словарь. 2001.