つよまる
tsuyomaru

Godan Verb (ru)

1. to get strong; to gain strength

Intransitive
その言葉 ことば かれ たいする疑惑 ぎわくはさらに つよまった。
sono kotobade kareni taisuru giwakuwa sarani tsuyomatta.
The words confirmed him in his suspicions.