How to read: やくそく
Pronunciation: 
Same names and idioms in reading:
役足 束約
Names and idioms with total stroke of 16:
雨沼 氷一朗 陵矢 先倉 望生
Names and idioms similar to 約束:
羈束 八束水 束嵯 違約金条項 車両新価保険特約
Yojijukugo(idioms with 4 Kanji characters) including 約束:
大信不約 博文約礼 約法三章