一弛一张 (一弛一張) yī shǐ yī zhāng

yī shǐ yī zhāng set phrase alternately relaxing and tightening; relaxing and tightening as appropriate
Domain: Idiom 成语 , Subdomain: , Concept:
Notes: A variant of 一张一弛 (Guoyu '一弛一張')