固く約束する
固く約束すること
the act of making a promise faithfully
固く約束する.
約束をふむ
to make a solemn promise with someone
約束すること
to keep one's promise―keep one's word―be true to one's word―be as good as one's word―keep an appointment―keep to an agreement―abide by an agreement
a promise or commitment to do something
I made him promise by compulsion
to fulfil one's promise―keep one's promise―keep one's word―make good one's promise―redeem one's pledge