1
feeling (much) obliged;being (very) grateful;being thankful
2
feeling sorry (for troubling someone);feeling ashamed (e.g. of an error);feeling embarrassed (e.g. by someone's compliments, hospitality, etc.)
oft. before a request, as 恐縮ですが
恐縮ですが、2月27日の約束をキャンセルさせてください。
I am very sorry, but I must cancel our appointment for February 27.
3
shrinking back in fear