go hand in hand(I thought ability in math and music were supposed to go hand in hand, but Tyler's much better in music than math.; между собой Val_Ships)
inextricably connected(Rosenkranz (1848) asserted that the mind and the spirit were inextricably connected, and that in order to be effective in instruction, a teacher had to be of good character. sashkomeister)
inextricably interwoven(Freemasonry is inextricably interwoven with the history of the United States. – неразрывно переплетено / связано сART Vancouver)
joined at the hip(1. very closely connected. The two companies have been joined at the hip since their founders went camping together a hundred years ago. 2. together. The new law would keep unhappy couples joined at the hip for the sake of their children. Etymology: based on the idea that some twins (= two babies born by the same mother at the same time) are born with some part of their bodies joined together. CI. Joined at the hip with the "new" cathedral, the old provides deep historic perspective Jealousy is joined at the hip with attachment and the belief that love, self-worth and success are found on the ... I am not joined at the hip with (my husband's) politics Director Edgar Wright swears Raising Arizona is "joined at the hip" with Raimi's Evil Dead II, which came out the same year. There's four songs on this record that we recorded at the same time we recorded TWDF – so it's kind of joined at the hip with that record. In local places economic progress needs to be joined at the hip with social progress and the two things thought of in the same breath. At the moment most European countries are joined at the hip with Russia far more then we are with America, and the reason is, ENERGY ... BBC Alexander Demidov)
inextricably linked to(Collins Cobuild Advanced Learner’s English Dictionary. New Digital Edition 2008; Longman Dictionary of Contemporary English 5th Ed. xakepxakep)
