This is the 5576th most frequent Japanese word.
くぐら
"くぐら" is not a standard Japanese word; it may be a form or variation of a verb. Please provide context for clarification.
Here, くぐって is used to describe passing through or underneath an object, which is the window in this case.
彼は窓をくぐって部屋に入った。
He went into the room through the window.
In this context, くぐり抜けた refers to overcoming or passing through challenging situations metaphorically.
彼女は困難を勇気でくぐり抜けた。
She bravely overcame the difficulties.
くぐらせた is used here to depict placing something underneath, in this case, the logs under the bridge.