訓 つ(む),つ(もる) ・ 音 セキ
Sino-Vietnamese: tích
禾 (grain) for meaning, 責 for sound: harvested stalks heaped high in the yard. To pile up, to accumulate — and hence area and volume.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
荷物を車に積みました。 (にもつをくるまにつみました)
I loaded the luggage into the car.