KanjiJLPT N1
Be Complete

be complete, uniform, all present

Mnemonic

Your hand reaches in front of you, sweeping scattered pieces into a perfect line. One by one, each item clicks into place. When your hand rests in front of the final piece, the set can at last be complete.
Additional thoughts
Picture a neat row of objects on a table. Your open palm pushes each one forward until every slot is filled — nothing missing, everything uniform and aligned.
Quick recall
A hand lines up every piece in front of you until the whole set can be complete.

Details

The keyword for 揃 is be complete. This kanji conveys the idea of everything being gathered together, aligned, or made uniform so that nothing is missing. It suggests a state where all parts or members are present and in order, forming a complete and consistent whole. The sense extends to things being arranged neatly or matching one another, emphasizing uniformity and thoroughness.
On'yomi
せん
Kun'yomi
そろ.える、そろ.う、そろ.い、き.る