press, push
撳 centers on applying steady force with the hand: pressing down or pushing against something.
撳 combines 扌 (hand) with 欽, which likely contributes the sound and may relate to pressing or respecting. The exact historical development is uncertain.
The hand radical 扌 beside 欽 suggests a hand pressing firmly, as if pushing a seal or stamp down with authority.
For キン, imagine pressing a kin (金, gold) seal into wax: kin -> キン, and the hand presses it down.