Harden / get hard

硬くなる：　to get hard

固める：かためる：something which is originally liquid congeals (clay, paint, ) OTHER MEANING: to harden or fortify one's defenses (or strengthen the unity of factions within the party).

硬直する：こうちょくする：　ｔｏ　ｂｅｃｏｍｅ　ｒｉｇｉｄ ???