つよtsuyoまるmaru
1.

To gradually increase in intensity or strength over time, often in relation to physical forces, emotions, or social dynamics.

2.

To develop a heightened degree of something, such as feelings, conditions, or conflicts, suggesting a shift towards a more powerful state.

3.

To experience a growing presence or influence, particularly in contexts where a situation or sentiment is evolving towards greater force or significance.

Example:

その言葉で彼に対する疑惑はさらに強まった。