cut, engrave, gravest
厝 centers on cutting or carving into a hard surface, especially for inscription or memorial purposes. The meanings 'cut', 'engrave', and 'gravest' all relate to shaping stone or material with a sharp tool.
厝 combines 厂 (cliff or shelter) with 昔 (old times). The exact historical development is uncertain, but it likely relates to cutting or engraving stone, perhaps associated with ancient inscriptions on cliff faces.
Under a cliff (厂), someone carves old memories (昔) into the rock: cutting and engraving a gravestone.
For サク, imagine carving a sack of stone tablets under the cliff: sack -> サク, and each tablet is engraved with old stories.