相手はいつでも飛びかかれる身構えを見せた。
His opponent took a stance that showed he was ready to pounce at any moment.
物音を聞いた犬は、低くうなって身構えをした。
Hearing the noise, the dog growled low and braced itself.
彼は最後まで身構えを崩さず、相手の出方をうかがっていた。
He kept his guard up to the end, watching to see what the other man would do.
初対面の人に対する彼女の身構えは、なかなか解けなかった。
Her guardedness toward people she was meeting for the first time did not ease readily.