Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
having a high threshold (for entry); difficult to approach; feeling awkward to go to (of someone's home)
Idiomatic expression
あんまりご無沙汰してしまって、どうも敷居が高くなってしまいました。I have neglected you so long that I feel a bit shy in visiting you.
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