恐縮

きょうしゅくkyoushuku

noun · suru verb · intransitive

1. feeling (much) obliged
2. being (very) grateful
3. being thankful
4. feeling sorry (for troubling someone)
5. feeling ashamed (e.g. of an error)
6. feeling embarrassed (e.g. by someone's compliments, hospitality, etc.)
7. shrinking back in fear

Study it in Yanamino