敷居 しきい たか
shikiiga takai

i-Adjective
Idiomatic Expression

1. having a high threshold (for entry); difficult to approach; feeling awkward to go to (of someone's home)

あんまりご 沙汰 さたしてしまって、どうも敷居 しきい たかくなってしまいました。
ammari gobusata shite shimatte dōmo shikiiga takakunatte shimaimashita.
I have neglected you so long that I feel a bit shy in visiting you.