The central building block at the top of an arch or vault
English: keystone, key, headstone
keystoneEnglish
keystone, anchor, backbone, headstone, key
Noun
A central cohesive source of support and stability
English: anchor, mainstay, keystone, backbone, linchpin, lynchpin
Bahasa: pembela, penyokong, tulang belakang, tulang punggung