ギクッと(with a) start, fright, alarm, creaking, cracking, snapping, popping

嘘(うそ)がバレてギクッとする。

I flinch with alarm when my lie is exposed. {(with a) start, fright, alarm, creaking, cracking, snapping, popping}

重(おも)い荷物(にもつ)を持(も)ったら腰(こし)がギクッとした。

When I picked up the heavy luggage, my back gave a sudden creak. {(with a) start, fright, alarm, creaking, cracking, snapping, popping}

容疑(ようぎ)者(しゃ)は証拠(しょうこ)を突(つ)きつけられてギクッとしている。

The suspect is startled when confronted with the evidence. {(with a) start, fright, alarm, creaking, cracking, snapping, popping}

不意(ふい)をつかれてギクッとしている間(ま)に逆転(ぎゃくてん)されてしまった。

While I was startled and taken aback, the situation was reversed on me. {(with a) start, fright, alarm, creaking, cracking, snapping, popping}

弱点(じゃくてん)を師匠(ししょう)に指摘(してき)されたその弟子(でし)は、ギクッとした表情(ひょうじょう)をしている。

The apprentice, who had his weaknesses pointed out by his master, has an expression of alarm on his face. {(with a) start, fright, alarm, creaking, cracking, snapping, popping}