立(た)ち入(い)り

立(た)ち入(い)り means entering an area, especially one that is restricted. Most commonly encountered as part of prohibition signs.

Forms

The verb is 立(た)ち入(い)る (to enter, to trespass). This noun form is the masu-stem nominalization.

Common collocations

• 立(た)ち入(い)り禁止(きんし): no entry, keep out (the most common phrase)
• 立(た)ち入(い)り検査(けんさ): on-site inspection (by authorities)
• 立(た)ち入(い)り調査(ちょうさ): on-site investigation
• 無断(むだん)立(た)ち入(い)り: unauthorized entry
• 立(た)ち入(い)り制限(せいげん): entry restrictions

Usage

Almost always used in formal, official, or legal contexts. You will see 立(た)ち入(い)り禁止(きんし) on signs at construction sites, private property, and restricted areas. In everyday conversation, 入(はい)る is the normal word for entering.