凝らす

(1)become stretched or tense or taut; "the bodybuilder's neck muscles tensed;" "the rope strained when the weight was attached"

(2)伸びる、緊張する、または張り詰める

(3)to exert much effort or energy; "straining our ears to hear"

(4)多くの努力またはエネルギーを使う

(1)