Russian translation: они понимают друг друга с полуслова
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Explanation: This phrase is also used in horoscopes/astrology very often. Like in:
There exists a natural complicity between an Ox man and an Ox woman. Their common life, therefore, has every chance of success, and failure will only be the outcome of exceptionally adverse circumstances or an unusual lack of good will on the part of both partners. As both love food and are good cooks, much time will be spent in the kitchen and at table — and mutual understanding will be greatly cemented there.
or the same meaning "иметь нечто общее" here:
Just as DPs have to understand the complicity between themselves the grips, electrics and ACs.