expression, godan verb (-ru)
break down a door; force a door open
Used for forcefully opening a door, often by breaking it. The expression is somewhat literal and less common in everyday speech than alternatives like ドアを壊す.
消防士が戸を破って中に入った。
The firefighter broke down the door and went inside.
More common and general way to say 'break a door'. 戸を破る is more specific to forcing entry and sounds slightly more dramatic or literary.
Compound of 戸 (to, 'door') + を (wo, object marker) + 破る (yaburu, 'to break'). The exact historical derivation is uncertain, but it follows a standard verb-object phrase pattern.