一張一弛[icchouisshi] tension and relaxation
弛む[yurumu] to become loose
弛み[tarumi] slack
弛む[tarumu] to slacken
中弛み[nakadarumi] a slump

弛緩[shikan] relaxation (e.g. of muscles)
弛張振動[shichoushindou] relaxation oscillation
筋弛緩剤[kinshikanzai] muscle-relaxant drug
弛まない[tayumanai] untiring
腕弛るい[kattarui] listless

矢っ張し[yappashi] also
ガラス張り[garasubari] glass-sided
威張り散らす[ibarichirasu] to domineer
意張る[ebaru] to be proud
意地っ張り[ijippari] obstinacy

一閑張り[ikkanbari] lacquered papier-mache
一張[icchou] one pair (set) of clothes
一張一弛[icchouisshi] tension and relaxation
一点張り[ittenbari] persistence
引っ張たく[hippataku] to slap