How to read: こらす、こごらす
Pronunciation: 
Same names and idioms in reading:
樵らす 懲らす
Names and idioms with total stroke of 20:
鬼娘 夫婦石 見之浦 兎紀夫 騮
Names and idioms similar to 凝らす:
凝集 角凝魂 凝灰石 凝帯 抗凝固
Yojijukugo(idioms with 4 Kanji characters) including 凝らす:
鳩首凝議 沈思凝想