Promise
Appointment, Pact
noun, する verb
A promise bundle is still a promise no matter how many you have wrapped up there. One promise is just another promise which is just another promise.
やくそく
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
土よう日は、コウイチとの約束があるからむりなのよね。日よう日はどう？
I can't make it because I have an appointment with Koichi on Saturday. How about Sunday?
あの男には、心中の約束をうら切られたの。
He chickened out on our suicide pact.
日程の件で色々と振り回しちゃって本当にごめんね。四日なら都合がつきそうです。次は今回みたいなドタキャンは絶対しないって約束します!
I’m really sorry to cause so much scheduling trouble. I can free up the fourth. I promise I will never cancel at the last minute like this again.